64924240 has 20 divisors (see below), whose sum is σ = 150949044. Its totient is φ = 25969664.

The previous prime is 64924231. The next prime is 64924247. The reversal of 64924240 is 4242946.

It can be written as a sum of positive squares in 2 ways, for example, as 13601344 + 51322896 = 3688^2 + 7164^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64924247) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 405697 + ... + 405856.

Almost surely, 2^64924240 is an apocalyptic number.

It is an amenable number.

64924240 is an abundant number, since it is smaller than the sum of its proper divisors (86024804).

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

64924240 is a wasteful number, since it uses less digits than its factorization.

64924240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 811566 (or 811560 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 31.

The square root of 64924240 is about 8057.5579427020. The cubic root of 64924240 is about 401.9163047794.

The spelling of 64924240 in words is "sixty-four million, nine hundred twenty-four thousand, two hundred forty".