51642642 has 16 divisors (see below), whose sum is σ = 103720320. Its totient is φ = 17141712.

The previous prime is 51642629. The next prime is 51642671. The reversal of 51642642 is 24624615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16573 + ... + 19440.

It is an arithmetic number, because the mean of its divisors is an integer number (6482520).

Almost surely, 2^51642642 is an apocalyptic number.

51642642 is an abundant number, since it is smaller than the sum of its proper divisors (52077678).

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

51642642 is a wasteful number, since it uses less digits than its factorization.

51642642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36257.

The product of its digits is 11520, while the sum is 30.

The square root of 51642642 is about 7186.2815141073. The cubic root of 51642642 is about 372.3941221239.

The spelling of 51642642 in words is "fifty-one million, six hundred forty-two thousand, six hundred forty-two".