55723993 has 16 divisors (see below), whose sum is σ = 62899200. Its totient is φ = 49008960.

The previous prime is 55723973. The next prime is 55724027. The reversal of 55723993 is 39932755.

It is not a de Polignac number, because 55723993 - 2¹⁷ = 55592921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55723933) 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, 28848 + ... + 30718.

It is an arithmetic number, because the mean of its divisors is an integer number (3931200).

Almost surely, 2^55723993 is an apocalyptic number.

It is an amenable number.

55723993 is a deficient number, since it is larger than the sum of its proper divisors (7175207).

55723993 is a wasteful number, since it uses less digits than its factorization.

55723993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1992.

The product of its digits is 255150, while the sum is 43.

The square root of 55723993 is about 7464.8505008473. The cubic root of 55723993 is about 381.9566506002.

The spelling of 55723993 in words is "fifty-five million, seven hundred twenty-three thousand, nine hundred ninety-three".