642156336 has 50 divisors (see below), whose sum is σ = 1858590492. Its totient is φ = 214051680.

The previous prime is 642156331. The next prime is 642156353. The reversal of 642156336 is 633651246.

642156336 is a `hidden beast` number, since 6 + 4 + 2 + 15 + 633 + 6 = 666.

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 642156336.

It is not an unprimeable number, because it can be changed into a prime (642156331) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 246450 + ... + 249041.

Almost surely, 2^642156336 is an apocalyptic number.

It is an amenable number.

642156336 is an abundant number, since it is smaller than the sum of its proper divisors (1216434156).

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

642156336 is a wasteful number, since it uses less digits than its factorization.

642156336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 495511 (or 495496 counting only the distinct ones).

The product of its digits is 77760, while the sum is 36.

The square root of 642156336 is about 25340.8037757290. The cubic root of 642156336 is about 862.7406421161.

The spelling of 642156336 in words is "six hundred forty-two million, one hundred fifty-six thousand, three hundred thirty-six".