612131256 has 240 divisors, whose sum is σ = 1944678120. Its totient is φ = 179625600.

The previous prime is 612131251. The next prime is 612131281. The reversal of 612131256 is 652131216.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (612131251) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 2900991 + ... + 2901201.

Almost surely, 2^612131256 is an apocalyptic number.

612131256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 612131256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (972339060).

612131256 is an abundant number, since it is smaller than the sum of its proper divisors (1332546864).

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

612131256 is a wasteful number, since it uses less digits than its factorization.

612131256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 264 counting only the distinct ones).

The product of its digits is 2160, while the sum is 27.

The square root of 612131256 is about 24741.2864661480. The cubic root of 612131256 is about 849.0791670361.

The spelling of 612131256 in words is "six hundred twelve million, one hundred thirty-one thousand, two hundred fifty-six".