55727978 has 16 divisors (see below), whose sum is σ = 85484160. Its totient is φ = 27238656.

The previous prime is 55727941. The next prime is 55727983. The reversal of 55727978 is 87972755.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21551 + ... + 23997.

It is an arithmetic number, because the mean of its divisors is an integer number (5342760).

Almost surely, 2^55727978 is an apocalyptic number.

55727978 is a deficient number, since it is larger than the sum of its proper divisors (29756182).

55727978 is a wasteful number, since it uses less digits than its factorization.

55727978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2701.

The product of its digits is 1234800, while the sum is 50.

The square root of 55727978 is about 7465.1174136781. The cubic root of 55727978 is about 381.9657553615.

The spelling of 55727978 in words is "fifty-five million, seven hundred twenty-seven thousand, nine hundred seventy-eight".