55753621 has 20 divisors (see below), whose sum is σ = 70988544. Its totient is φ = 43423800.

The previous prime is 55753613. The next prime is 55753627. The reversal of 55753621 is 12635755.

It is not a de Polignac number, because 55753621 - 2³ = 55753613 is a prime.

It is a super-2 number, since 2×55753621² = 6216932509223282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55753627) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 25356 + ... + 27466.

Almost surely, 2^55753621 is an apocalyptic number.

It is an amenable number.

55753621 is a deficient number, since it is larger than the sum of its proper divisors (15234923).

55753621 is an equidigital number, since it uses as much as digits as its factorization.

55753621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2150 (or 2129 counting only the distinct ones).

The product of its digits is 31500, while the sum is 34.

The square root of 55753621 is about 7466.8347376917. The cubic root of 55753621 is about 382.0243330351.

The spelling of 55753621 in words is "fifty-five million, seven hundred fifty-three thousand, six hundred twenty-one".