642178032 has 40 divisors (see below), whose sum is σ = 1731091584. Its totient is φ = 204752064.

The previous prime is 642178021. The next prime is 642178037. The reversal of 642178032 is 230871246.

It is a junction number, because it is equal to n+sod(n) for n = 642177984 and 642178002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (642178037) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289738 + ... + 291945.

Almost surely, 2^642178032 is an apocalyptic number.

It is an amenable number.

642178032 is an abundant number, since it is smaller than the sum of its proper divisors (1088913552).

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

642178032 is a wasteful number, since it uses less digits than its factorization.

642178032 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 581717 (or 581711 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 642178032 is about 25341.2318564035. The cubic root of 642178032 is about 862.7503582393.

The spelling of 642178032 in words is "six hundred forty-two million, one hundred seventy-eight thousand, thirty-two".