51629994 has 32 divisors (see below), whose sum is σ = 123560640. Its totient is φ = 15885936.

The previous prime is 51629989. The next prime is 51630023. The reversal of 51629994 is 49992615.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36072 + ... + 37475.

It is an arithmetic number, because the mean of its divisors is an integer number (3861270).

Almost surely, 2^51629994 is an apocalyptic number.

51629994 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

51629994 is an abundant number, since it is smaller than the sum of its proper divisors (71930646).

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

51629994 is a wasteful number, since it uses less digits than its factorization.

51629994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73571 (or 73565 counting only the distinct ones).

The product of its digits is 174960, while the sum is 45.

The square root of 51629994 is about 7185.4014501627. The cubic root of 51629994 is about 372.3637181448.

The spelling of 51629994 in words is "fifty-one million, six hundred twenty-nine thousand, nine hundred ninety-four".