64992240 has 80 divisors (see below), whose sum is σ = 223869600. Its totient is φ = 17330688.

The previous prime is 64992229. The next prime is 64992247. The reversal of 64992240 is 4229946.

64992240 is a `hidden beast` number, since 649 + 9 + 2 + 2 + 4 + 0 = 666.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 64992195 and 64992204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64992247) 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, 12885 + ... + 17204.

It is an arithmetic number, because the mean of its divisors is an integer number (2798370).

Almost surely, 2^64992240 is an apocalyptic number.

64992240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

64992240 is an abundant number, since it is smaller than the sum of its proper divisors (158877360).

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

64992240 is a wasteful number, since it uses less digits than its factorization.

64992240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30111 (or 30099 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 64992240 is about 8061.7764791639. The cubic root of 64992240 is about 402.0565747955.

The spelling of 64992240 in words is "sixty-four million, nine hundred ninety-two thousand, two hundred forty".