256015590 has 16 divisors (see below), whose sum is σ = 614437488. Its totient is φ = 68270816.

The previous prime is 256015561. The next prime is 256015619. The reversal of 256015590 is 95510652.

It is an interprime number because it is at equal distance from previous prime (256015561) and next prime (256015619).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4266897 + ... + 4266956.

It is an arithmetic number, because the mean of its divisors is an integer number (38402343).

Almost surely, 2^256015590 is an apocalyptic number.

256015590 is an abundant number, since it is smaller than the sum of its proper divisors (358421898).

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

256015590 is a wasteful number, since it uses less digits than its factorization.

256015590 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8533863.

The product of its (nonzero) digits is 13500, while the sum is 33.

The square root of 256015590 is about 16000.4871800830. The cubic root of 256015590 is about 634.9733098915.

The spelling of 256015590 in words is "two hundred fifty-six million, fifteen thousand, five hundred ninety".