642247625 has 16 divisors (see below), whose sum is σ = 805584000. Its totient is φ = 511196400.

The previous prime is 642247603. The next prime is 642247631. The reversal of 642247625 is 526742246.

It is a happy number.

It is not a de Polignac number, because 642247625 - 2¹⁸ = 641985481 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11966 + ... + 37784.

It is an arithmetic number, because the mean of its divisors is an integer number (50349000).

Almost surely, 2^642247625 is an apocalyptic number.

It is an amenable number.

642247625 is a deficient number, since it is larger than the sum of its proper divisors (163336375).

642247625 is a wasteful number, since it uses less digits than its factorization.

642247625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26033 (or 26023 counting only the distinct ones).

The product of its digits is 161280, while the sum is 38.

The square root of 642247625 is about 25342.6049371409. The cubic root of 642247625 is about 862.7815226069.

The spelling of 642247625 in words is "six hundred forty-two million, two hundred forty-seven thousand, six hundred twenty-five".