55086721 has 8 divisors (see below), whose sum is σ = 57797888. Its totient is φ = 52434000.

The previous prime is 55086701. The next prime is 55086737. The reversal of 55086721 is 12768055.

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

It is a cyclic number.

It is not a de Polignac number, because 55086721 - 2⁷ = 55086593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55086701) 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, 12675 + ... + 16456.

It is an arithmetic number, because the mean of its divisors is an integer number (7224736).

Almost surely, 2^55086721 is an apocalyptic number.

It is an amenable number.

55086721 is a deficient number, since it is larger than the sum of its proper divisors (2711167).

55086721 is a wasteful number, since it uses less digits than its factorization.

55086721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29223.

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 55086721 is about 7422.0429128374. The cubic root of 55086721 is about 380.4950173836.

The spelling of 55086721 in words is "fifty-five million, eighty-six thousand, seven hundred twenty-one".