642532400 has 30 divisors (see below), whose sum is σ = 1543685052. Its totient is φ = 257012800.

The previous prime is 642532399. The next prime is 642532427. The reversal of 642532400 is 4235246.

It is a self number, because there is not a number n which added to its sum of digits gives 642532400.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 802766 + ... + 803565.

Almost surely, 2^642532400 is an apocalyptic number.

It is an amenable number.

642532400 is an abundant number, since it is smaller than the sum of its proper divisors (901152652).

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

642532400 is a wasteful number, since it uses less digits than its factorization.

642532400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1606349 (or 1606338 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 642532400 is about 25348.2228173890. Note that the first 3 decimals coincide. The cubic root of 642532400 is about 862.9090239490.

Adding to 642532400 its reverse (4235246), we get a palindrome (646767646).

The spelling of 642532400 in words is "six hundred forty-two million, five hundred thirty-two thousand, four hundred".