642064156 has 12 divisors (see below), whose sum is σ = 1136237760. Its totient is φ = 317424800.

The previous prime is 642064103. The next prime is 642064183. The reversal of 642064156 is 651460246.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 901420 + ... + 902131.

It is an arithmetic number, because the mean of its divisors is an integer number (94686480).

Almost surely, 2^642064156 is an apocalyptic number.

It is an amenable number.

642064156 is a deficient number, since it is larger than the sum of its proper divisors (494173604).

642064156 is a wasteful number, since it uses less digits than its factorization.

642064156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1803644 (or 1803642 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 34.

The square root of 642064156 is about 25338.9849046879. The cubic root of 642064156 is about 862.6993586915.

The spelling of 642064156 in words is "six hundred forty-two million, sixty-four thousand, one hundred fifty-six".