55668390 has 16 divisors (see below), whose sum is σ = 133604208. Its totient is φ = 14844896.

The previous prime is 55668373. The next prime is 55668419. The reversal of 55668390 is 9386655.

It is a congruent number.

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, 927777 + ... + 927836.

It is an arithmetic number, because the mean of its divisors is an integer number (8350263).

Almost surely, 2^55668390 is an apocalyptic number.

55668390 is an abundant number, since it is smaller than the sum of its proper divisors (77935818).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55668390 is a wasteful number, since it uses less digits than its factorization.

55668390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1855623.

The product of its (nonzero) digits is 194400, while the sum is 42.

The square root of 55668390 is about 7461.1252502555. The cubic root of 55668390 is about 381.8295658840.

The spelling of 55668390 in words is "fifty-five million, six hundred sixty-eight thousand, three hundred ninety".