256161404 has 6 divisors (see below), whose sum is σ = 448282464. Its totient is φ = 128080700.

The previous prime is 256161377. The next prime is 256161427. The reversal of 256161404 is 404161652.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32020172 + ... + 32020179.

It is an arithmetic number, because the mean of its divisors is an integer number (74713744).

Almost surely, 2^256161404 is an apocalyptic number.

It is an amenable number.

256161404 is a deficient number, since it is larger than the sum of its proper divisors (192121060).

256161404 is a wasteful number, since it uses less digits than its factorization.

256161404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64040355 (or 64040353 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 256161404 is about 16005.0430802294. The cubic root of 256161404 is about 635.0938369603.

The spelling of 256161404 in words is "two hundred fifty-six million, one hundred sixty-one thousand, four hundred four".