656178054 has 128 divisors (see below), whose sum is σ = 1626365952. Its totient is φ = 172523520.

The previous prime is 656178049. The next prime is 656178067. The reversal of 656178054 is 450871656.

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

It is a junction number, because it is equal to n+sod(n) for n = 656177997 and 656178015.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2553094 + ... + 2553350.

It is an arithmetic number, because the mean of its divisors is an integer number (12705984).

Almost surely, 2^656178054 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 656178054, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (813182976).

656178054 is an abundant number, since it is smaller than the sum of its proper divisors (970187898).

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

656178054 is a wasteful number, since it uses less digits than its factorization.

656178054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 390.

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 656178054 is about 25615.9726342765. The cubic root of 656178054 is about 868.9749030816.

The spelling of 656178054 in words is "six hundred fifty-six million, one hundred seventy-eight thousand, fifty-four".