64364220 has 120 divisors (see below), whose sum is σ = 205272144. Its totient is φ = 16879104.

The previous prime is 64364213. The next prime is 64364231. The reversal of 64364220 is 2246346.

64364220 is a `hidden beast` number, since 6 + 436 + 4 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 108244 + ... + 108836.

Almost surely, 2^64364220 is an apocalyptic number.

64364220 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 64364220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102636072).

64364220 is an abundant number, since it is smaller than the sum of its proper divisors (140907924).

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

64364220 is a wasteful number, since it uses less digits than its factorization.

64364220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 681 (or 670 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 27.

The square root of 64364220 is about 8022.7314550594. The cubic root of 64364220 is about 400.7573567884.

The spelling of 64364220 in words is "sixty-four million, three hundred sixty-four thousand, two hundred twenty".