655756878 has 64 divisors (see below), whose sum is σ = 1620891648. Its totient is φ = 172577280.

The previous prime is 655756877. The next prime is 655756879. The reversal of 655756878 is 878657556.

It is an interprime number because it is at equal distance from previous prime (655756877) and next prime (655756879).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (655756877) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23788 + ... + 43328.

It is an arithmetic number, because the mean of its divisors is an integer number (25326432).

Almost surely, 2^655756878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 655756878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (810445824).

655756878 is an abundant number, since it is smaller than the sum of its proper divisors (965134770).

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

655756878 is a wasteful number, since it uses less digits than its factorization.

655756878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19617.

The product of its digits is 14112000, while the sum is 57.

The square root of 655756878 is about 25607.7503502358. The cubic root of 655756878 is about 868.7889425257.

The spelling of 655756878 in words is "six hundred fifty-five million, seven hundred fifty-six thousand, eight hundred seventy-eight".