51621630 has 32 divisors (see below), whose sum is σ = 124084224. Its totient is φ = 13744416.

The previous prime is 51621617. The next prime is 51621659. The reversal of 51621630 is 3612615.

It is a self number, because there is not a number n which added to its sum of digits gives 51621630.

It is a congruent number.

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, 31819 + ... + 33401.

It is an arithmetic number, because the mean of its divisors is an integer number (3877632).

Almost surely, 2^51621630 is an apocalyptic number.

51621630 is an abundant number, since it is smaller than the sum of its proper divisors (72462594).

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

51621630 is a wasteful number, since it uses less digits than its factorization.

51621630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2680.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 51621630 is about 7184.8194131794. The cubic root of 51621630 is about 372.3436095600.

The spelling of 51621630 in words is "fifty-one million, six hundred twenty-one thousand, six hundred thirty".