256072473 has 6 divisors (see below), whose sum is σ = 369882474. Its totient is φ = 170714976.

The previous prime is 256072469. The next prime is 256072477. The reversal of 256072473 is 374270652.

It is a happy number.

256072473 is a `hidden beast` number, since 2 + 5 + 607 + 2 + 47 + 3 = 666.

It is an interprime number because it is at equal distance from previous prime (256072469) and next prime (256072477).

It can be written as a sum of positive squares in only one way, i.e., 241118784 + 14953689 = 15528^2 + 3867^2 .

It is not a de Polignac number, because 256072473 - 2² = 256072469 is a prime.

It is a super-2 number, since 2×256072473² = 131146222856671458, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (256072477) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14226240 + ... + 14226257.

It is an arithmetic number, because the mean of its divisors is an integer number (61647079).

Almost surely, 2^256072473 is an apocalyptic number.

It is an amenable number.

256072473 is a deficient number, since it is larger than the sum of its proper divisors (113810001).

256072473 is a wasteful number, since it uses less digits than its factorization.

256072473 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28452503 (or 28452500 counting only the distinct ones).

The product of its (nonzero) digits is 70560, while the sum is 36.

The square root of 256072473 is about 16002.2646209841. The cubic root of 256072473 is about 635.0203337362.

The spelling of 256072473 in words is "two hundred fifty-six million, seventy-two thousand, four hundred seventy-three".