55573731 has 24 divisors (see below), whose sum is σ = 87744384. Its totient is φ = 33742080.

The previous prime is 55573723. The next prime is 55573747. The reversal of 55573731 is 13737555.

It is a happy number.

55573731 is a `hidden beast` number, since 55 + 573 + 7 + 31 = 666.

It is not a de Polignac number, because 55573731 - 2³ = 55573723 is a prime.

It is a super-2 number, since 2×55573731² = 6176879154520722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (55573751) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1116 + ... + 10601.

It is an arithmetic number, because the mean of its divisors is an integer number (3656016).

Almost surely, 2^55573731 is an apocalyptic number.

55573731 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

55573731 is a deficient number, since it is larger than the sum of its proper divisors (32170653).

55573731 is a wasteful number, since it uses less digits than its factorization.

55573731 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11771 (or 11768 counting only the distinct ones).

The product of its digits is 55125, while the sum is 36.

The square root of 55573731 is about 7454.7790711731. The cubic root of 55573731 is about 381.6130210277.

The spelling of 55573731 in words is "fifty-five million, five hundred seventy-three thousand, seven hundred thirty-one".