55178660 has 24 divisors (see below), whose sum is σ = 121974720. Its totient is φ = 20909664.

The previous prime is 55178657. The next prime is 55178663. The reversal of 55178660 is 6687155.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (55178657) and next prime (55178663).

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is not an unprimeable number, because it can be changed into a prime (55178663) 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, 72224 + ... + 72983.

It is an arithmetic number, because the mean of its divisors is an integer number (5082280).

Almost surely, 2^55178660 is an apocalyptic number.

It is an amenable number.

55178660 is an abundant number, since it is smaller than the sum of its proper divisors (66796060).

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

55178660 is a wasteful number, since it uses less digits than its factorization.

55178660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145235 (or 145233 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 55178660 is about 7428.2339758519. The cubic root of 55178660 is about 380.7065800924.

The spelling of 55178660 in words is "fifty-five million, one hundred seventy-eight thousand, six hundred sixty".