642909024 has 36 divisors (see below), whose sum is σ = 1828273356. Its totient is φ = 214302912.

The previous prime is 642908999. The next prime is 642909049. The reversal of 642909024 is 420909246.

642909024 is a `hidden beast` number, since 642 + 9 + 0 + 9 + 0 + 2 + 4 = 666.

It is an interprime number because it is at equal distance from previous prime (642908999) and next prime (642909049).

It is a tau number, because it is divible by the number of its divisors (36).

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

It is a self number, because there is not a number n which added to its sum of digits gives 642909024.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1115874 + ... + 1116449.

It is an arithmetic number, because the mean of its divisors is an integer number (50785371).

Almost surely, 2^642909024 is an apocalyptic number.

It is an amenable number.

642909024 is an abundant number, since it is smaller than the sum of its proper divisors (1185364332).

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

642909024 is a wasteful number, since it uses less digits than its factorization.

642909024 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2232339 (or 2232328 counting only the distinct ones).

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

The square root of 642909024 is about 25355.6507311487. The cubic root of 642909024 is about 863.0775906860.

The spelling of 642909024 in words is "six hundred forty-two million, nine hundred nine thousand, twenty-four".