64724990 has 32 divisors (see below), whose sum is σ = 132627456. Its totient is φ = 22512160.

The previous prime is 64724987. The next prime is 64724999. The reversal of 64724990 is 9942746.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64724999) 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, 10262 + ... + 15321.

It is an arithmetic number, because the mean of its divisors is an integer number (4144608).

Almost surely, 2^64724990 is an apocalyptic number.

64724990 is an abundant number, since it is smaller than the sum of its proper divisors (67902466).

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

64724990 is a wasteful number, since it uses less digits than its factorization.

64724990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25624.

The product of its (nonzero) digits is 108864, while the sum is 41.

The square root of 64724990 is about 8045.1842738374. The cubic root of 64724990 is about 401.5047282179.

The spelling of 64724990 in words is "sixty-four million, seven hundred twenty-four thousand, nine hundred ninety".