55187998 has 8 divisors (see below), whose sum is σ = 85452480. Its totient is φ = 26703840.

The previous prime is 55187983. The next prime is 55188031. The reversal of 55187998 is 89978155.

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

It is a congruent number.

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, 445003 + ... + 445126.

It is an arithmetic number, because the mean of its divisors is an integer number (10681560).

Almost surely, 2^55187998 is an apocalyptic number.

55187998 is a deficient number, since it is larger than the sum of its proper divisors (30264482).

55187998 is a wasteful number, since it uses less digits than its factorization.

55187998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 890162.

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

The square root of 55187998 is about 7428.8624970449. The cubic root of 55187998 is about 380.7280548046.

The spelling of 55187998 in words is "fifty-five million, one hundred eighty-seven thousand, nine hundred ninety-eight".