64719928 has 64 divisors (see below), whose sum is σ = 157248000. Its totient is φ = 24250752.

The previous prime is 64719917. The next prime is 64719931. The reversal of 64719928 is 82991746.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11493 + ... + 16171.

It is an arithmetic number, because the mean of its divisors is an integer number (2457000).

Almost surely, 2^64719928 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 64719928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (78624000).

64719928 is an abundant number, since it is smaller than the sum of its proper divisors (92528072).

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

64719928 is a wasteful number, since it uses less digits than its factorization.

64719928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4724 (or 4720 counting only the distinct ones).

The product of its digits is 217728, while the sum is 46.

The square root of 64719928 is about 8044.8696695472. The cubic root of 64719928 is about 401.4942610092.

The spelling of 64719928 in words is "sixty-four million, seven hundred nineteen thousand, nine hundred twenty-eight".