642072984 has 32 divisors (see below), whose sum is σ = 1834494720. Its totient is φ = 183449376.

The previous prime is 642072929. The next prime is 642073031. The reversal of 642072984 is 489270246.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1910764 + ... + 1911099.

It is an arithmetic number, because the mean of its divisors is an integer number (57327960).

Almost surely, 2^642072984 is an apocalyptic number.

It is an amenable number.

642072984 is an abundant number, since it is smaller than the sum of its proper divisors (1192421736).

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

642072984 is a wasteful number, since it uses less digits than its factorization.

642072984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3821879 (or 3821875 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 642072984 is about 25339.1591020697. The cubic root of 642072984 is about 862.7033125409.

The spelling of 642072984 in words is "six hundred forty-two million, seventy-two thousand, nine hundred eighty-four".