642267400 has 48 divisors (see below), whose sum is σ = 1495233540. Its totient is φ = 256569600.

The previous prime is 642267389. The next prime is 642267401. The reversal of 642267400 is 4762246.

It can be written as a sum of positive squares in 6 ways, for example, as 447999556 + 194267844 = 21166^2 + 13938^2 .

It is not an unprimeable number, because it can be changed into a prime (642267401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 197790 + ... + 201010.

Almost surely, 2^642267400 is an apocalyptic number.

It is an amenable number.

642267400 is an abundant number, since it is smaller than the sum of its proper divisors (852966140).

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

642267400 is a wasteful number, since it uses less digits than its factorization.

642267400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4234 (or 4225 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 31.

The square root of 642267400 is about 25342.9950874004. The cubic root of 642267400 is about 862.7903776180.

The spelling of 642267400 in words is "six hundred forty-two million, two hundred sixty-seven thousand, four hundred".