55077918 has 64 divisors (see below), whose sum is σ = 130014720. Its totient is φ = 15230592.

The previous prime is 55077901. The next prime is 55077983. The reversal of 55077918 is 81977055.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 55077918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 242521 + ... + 242747.

It is an arithmetic number, because the mean of its divisors is an integer number (2031480).

Almost surely, 2^55077918 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55077918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (65007360).

55077918 is an abundant number, since it is smaller than the sum of its proper divisors (74936802).

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

55077918 is a wasteful number, since it uses less digits than its factorization.

55077918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 401.

The product of its (nonzero) digits is 88200, while the sum is 42.

The square root of 55077918 is about 7421.4498583498. The cubic root of 55077918 is about 380.4747482757.

The spelling of 55077918 in words is "fifty-five million, seventy-seven thousand, nine hundred eighteen".