256601972 has 12 divisors (see below), whose sum is σ = 489876576. Its totient is φ = 116637240.

The previous prime is 256601971. The next prime is 256601981. The reversal of 256601972 is 279106652.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256601971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2915888 + ... + 2915975.

It is an arithmetic number, because the mean of its divisors is an integer number (40823048).

Almost surely, 2^256601972 is an apocalyptic number.

256601972 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

256601972 is a deficient number, since it is larger than the sum of its proper divisors (233274604).

256601972 is a wasteful number, since it uses less digits than its factorization.

256601972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5831878 (or 5831876 counting only the distinct ones).

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 256601972 is about 16018.8005793193. The cubic root of 256601972 is about 635.4577244172.

The spelling of 256601972 in words is "two hundred fifty-six million, six hundred one thousand, nine hundred seventy-two".