64873220 has 48 divisors (see below), whose sum is σ = 145286400. Its totient is φ = 24261120.

The previous prime is 64873157. The next prime is 64873223. The reversal of 64873220 is 2237846.

It is not an unprimeable number, because it can be changed into a prime (64873223) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28940 + ... + 31100.

It is an arithmetic number, because the mean of its divisors is an integer number (3026800).

Almost surely, 2^64873220 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 64873220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72643200).

64873220 is an abundant number, since it is smaller than the sum of its proper divisors (80413180).

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

64873220 is a wasteful number, since it uses less digits than its factorization.

64873220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2268 (or 2266 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 32.

The square root of 64873220 is about 8054.3913488233. The cubic root of 64873220 is about 401.8109966868.

The spelling of 64873220 in words is "sixty-four million, eight hundred seventy-three thousand, two hundred twenty".