642250425 has 36 divisors (see below), whose sum is σ = 1072166000. Its totient is φ = 339237600.

The previous prime is 642250421. The next prime is 642250439. The reversal of 642250425 is 524052246.

It is a happy number.

It is not a de Polignac number, because 642250425 - 2² = 642250421 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 642250392 and 642250401.

It is not an unprimeable number, because it can be changed into a prime (642250421) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1286826 + ... + 1287324.

Almost surely, 2^642250425 is an apocalyptic number.

It is an amenable number.

642250425 is a deficient number, since it is larger than the sum of its proper divisors (429915575).

642250425 is a wasteful number, since it uses less digits than its factorization.

642250425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774 (or 638 counting only the distinct ones).

The product of its (nonzero) digits is 19200, while the sum is 30.

The square root of 642250425 is about 25342.6601800206. The cubic root of 642250425 is about 862.7827764249.

The spelling of 642250425 in words is "six hundred forty-two million, two hundred fifty thousand, four hundred twenty-five".