55752621 has 16 divisors (see below), whose sum is σ = 77875584. Its totient is φ = 35411904.

The previous prime is 55752617. The next prime is 55752623. The reversal of 55752621 is 12625755.

It is not a de Polignac number, because 55752621 - 2² = 55752617 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55752623) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17655 + ... + 20571.

It is an arithmetic number, because the mean of its divisors is an integer number (4867224).

Almost surely, 2^55752621 is an apocalyptic number.

It is an amenable number.

55752621 is a deficient number, since it is larger than the sum of its proper divisors (22122963).

55752621 is a wasteful number, since it uses less digits than its factorization.

55752621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3220.

The product of its digits is 21000, while the sum is 33.

The square root of 55752621 is about 7466.7677746131. The cubic root of 55752621 is about 382.0220490183.

The spelling of 55752621 in words is "fifty-five million, seven hundred fifty-two thousand, six hundred twenty-one".