64373220 has 144 divisors (see below), whose sum is σ = 209729520. Its totient is φ = 15925248.

The previous prime is 64373209. The next prime is 64373291. The reversal of 64373220 is 2237346.

64373220 is a `hidden beast` number, since 6 + 437 + 3 + 220 = 666.

64373220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 8 ways, for example, as 116964 + 64256256 = 342^2 + 8016^2 .

It is a super-2 number, since 2×64373220² = 8287822906336800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 333444 + ... + 333636.

It is an arithmetic number, because the mean of its divisors is an integer number (1456455).

Almost surely, 2^64373220 is an apocalyptic number.

64373220 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64373220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104864760).

64373220 is an abundant number, since it is smaller than the sum of its proper divisors (145356300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64373220 is a wasteful number, since it uses less digits than its factorization.

64373220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 334 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 64373220 is about 8023.2923416762. The cubic root of 64373220 is about 400.7760351168.

The spelling of 64373220 in words is "sixty-four million, three hundred seventy-three thousand, two hundred twenty".