642725436 has 24 divisors (see below), whose sum is σ = 1510485760. Its totient is φ = 212699952.

The previous prime is 642725417. The next prime is 642725453. The reversal of 642725436 is 634527246.

It is a junction number, because it is equal to n+sod(n) for n = 642725394 and 642725403.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 190996 + ... + 194331.

Almost surely, 2^642725436 is an apocalyptic number.

It is an amenable number.

642725436 is an abundant number, since it is smaller than the sum of its proper divisors (867760324).

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

642725436 is a wasteful number, since it uses less digits than its factorization.

642725436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385473 (or 385471 counting only the distinct ones).

The product of its digits is 241920, while the sum is 39.

The square root of 642725436 is about 25352.0302145607. The cubic root of 642725436 is about 862.9954298787.

The spelling of 642725436 in words is "six hundred forty-two million, seven hundred twenty-five thousand, four hundred thirty-six".