55823721 has 8 divisors (see below), whose sum is σ = 74599200. Its totient is φ = 37132032.

The previous prime is 55823717. The next prime is 55823743. The reversal of 55823721 is 12732855.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 55823721 - 2² = 55823717 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (55823701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19375 + ... + 22068.

It is an arithmetic number, because the mean of its divisors is an integer number (9324900).

Almost surely, 2^55823721 is an apocalyptic number.

It is an amenable number.

55823721 is a deficient number, since it is larger than the sum of its proper divisors (18775479).

55823721 is a wasteful number, since it uses less digits than its factorization.

55823721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41895.

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

The square root of 55823721 is about 7471.5273538949. The cubic root of 55823721 is about 382.1843745982.

The spelling of 55823721 in words is "fifty-five million, eight hundred twenty-three thousand, seven hundred twenty-one".