55840731 has 4 divisors (see below), whose sum is σ = 74454312. Its totient is φ = 37227152.

The previous prime is 55840721. The next prime is 55840739. The reversal of 55840731 is 13704855.

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 55840731 - 2⁶ = 55840667 is a prime.

It is a super-2 number, since 2×55840731² = 6236374477228722, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55840692 and 55840701.

It is not an unprimeable number, because it can be changed into a prime (55840739) 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, 9306786 + ... + 9306791.

It is an arithmetic number, because the mean of its divisors is an integer number (18613578).

Almost surely, 2^55840731 is an apocalyptic number.

55840731 is a deficient number, since it is larger than the sum of its proper divisors (18613581).

55840731 is a wasteful number, since it uses less digits than its factorization.

55840731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18613580.

The product of its (nonzero) digits is 16800, while the sum is 33.

The square root of 55840731 is about 7472.6655886638. The cubic root of 55840731 is about 382.2231890180.

The spelling of 55840731 in words is "fifty-five million, eight hundred forty thousand, seven hundred thirty-one".