55621630 has 16 divisors (see below), whose sum is σ = 101761344. Its totient is φ = 21883680.

The previous prime is 55621627. The next prime is 55621649. The reversal of 55621630 is 3612655.

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 7 ways as a sum of consecutive naturals, for example, 44982 + ... + 46201.

It is an arithmetic number, because the mean of its divisors is an integer number (6360084).

Almost surely, 2^55621630 is an apocalyptic number.

55621630 is a deficient number, since it is larger than the sum of its proper divisors (46139714).

55621630 is a wasteful number, since it uses less digits than its factorization.

55621630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91251.

The product of its (nonzero) digits is 5400, while the sum is 28.

The square root of 55621630 is about 7457.9910163529. The cubic root of 55621630 is about 381.7226269677.

The spelling of 55621630 in words is "fifty-five million, six hundred twenty-one thousand, six hundred thirty".