642605382 has 24 divisors (see below), whose sum is σ = 1426272120. Its totient is φ = 208977120.

The previous prime is 642605371. The next prime is 642605399. The reversal of 642605382 is 283506246.

642605382 is a `hidden beast` number, since 6 + 42 + 605 + 3 + 8 + 2 = 666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 434632 + ... + 436107.

It is an arithmetic number, because the mean of its divisors is an integer number (59428005).

Almost surely, 2^642605382 is an apocalyptic number.

642605382 is an abundant number, since it is smaller than the sum of its proper divisors (783666738).

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

642605382 is a wasteful number, since it uses less digits than its factorization.

642605382 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 870788 (or 870785 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 642605382 is about 25349.6623646154. The cubic root of 642605382 is about 862.9416938669.

The spelling of 642605382 in words is "six hundred forty-two million, six hundred five thousand, three hundred eighty-two".