51640494 has 24 divisors (see below), whose sum is σ = 104600760. Its totient is φ = 16994880.

The previous prime is 51640487. The next prime is 51640507. The reversal of 51640494 is 49404615.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183634 + ... + 183914.

It is an arithmetic number, because the mean of its divisors is an integer number (4358365).

Almost surely, 2^51640494 is an apocalyptic number.

51640494 is an abundant number, since it is smaller than the sum of its proper divisors (52960266).

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

51640494 is a wasteful number, since it uses less digits than its factorization.

51640494 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 676 (or 395 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 51640494 is about 7186.1320611300. The cubic root of 51640494 is about 372.3889589898.

The spelling of 51640494 in words is "fifty-one million, six hundred forty thousand, four hundred ninety-four".