55620791 has 4 divisors (see below), whose sum is σ = 55676712. Its totient is φ = 55564872.

The previous prime is 55620781. The next prime is 55620833. The reversal of 55620791 is 19702655.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 55620791 - 2¹⁴ = 55604407 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55620781) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26441 + ... + 28466.

It is an arithmetic number, because the mean of its divisors is an integer number (13919178).

Almost surely, 2^55620791 is an apocalyptic number.

55620791 is a deficient number, since it is larger than the sum of its proper divisors (55921).

55620791 is a wasteful number, since it uses less digits than its factorization.

55620791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55920.

The product of its (nonzero) digits is 18900, while the sum is 35.

The square root of 55620791 is about 7457.9347677490. The cubic root of 55620791 is about 381.7207076491.

The spelling of 55620791 in words is "fifty-five million, six hundred twenty thousand, seven hundred ninety-one".