256405616 has 10 divisors (see below), whose sum is σ = 496785912. Its totient is φ = 128202800.

The previous prime is 256405613. The next prime is 256405663. The reversal of 256405616 is 616504652.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256405613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8012660 + ... + 8012691.

Almost surely, 2^256405616 is an apocalyptic number.

It is an amenable number.

256405616 is a deficient number, since it is larger than the sum of its proper divisors (240380296).

256405616 is a wasteful number, since it uses less digits than its factorization.

256405616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16025359 (or 16025353 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 35.

The square root of 256405616 is about 16012.6704830893. The cubic root of 256405616 is about 635.2955955290.

The spelling of 256405616 in words is "two hundred fifty-six million, four hundred five thousand, six hundred sixteen".