55189978 has 8 divisors (see below), whose sum is σ = 82903860. Its totient is φ = 27555360.

The previous prime is 55189969. The next prime is 55189997. The reversal of 55189978 is 87998155.

It can be written as a sum of positive squares in 2 ways, for example, as 37859409 + 17330569 = 6153^2 + 4163^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18043 + ... + 20878.

Almost surely, 2^55189978 is an apocalyptic number.

55189978 is a deficient number, since it is larger than the sum of its proper divisors (27713882).

55189978 is a wasteful number, since it uses less digits than its factorization.

55189978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39632.

The product of its digits is 907200, while the sum is 52.

The square root of 55189978 is about 7428.9957598588. The cubic root of 55189978 is about 380.7326079234.

The spelling of 55189978 in words is "fifty-five million, one hundred eighty-nine thousand, nine hundred seventy-eight".