64719564 has 144 divisors (see below), whose sum is σ = 192826368. Its totient is φ = 16533504.

The previous prime is 64719563. The next prime is 64719569. The reversal of 64719564 is 46591746.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (64719563) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 667164 + ... + 667260.

It is an arithmetic number, because the mean of its divisors is an integer number (1339072).

Almost surely, 2^64719564 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 64719564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96413184).

64719564 is an abundant number, since it is smaller than the sum of its proper divisors (128106804).

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

64719564 is a wasteful number, since it uses less digits than its factorization.

64719564 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 184 (or 169 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 64719564 is about 8044.8470464018. The cubic root of 64719564 is about 401.4935083086.

The spelling of 64719564 in words is "sixty-four million, seven hundred nineteen thousand, five hundred sixty-four".