256673390 has 16 divisors (see below), whose sum is σ = 462596400. Its totient is φ = 102539520.

The previous prime is 256673387. The next prime is 256673393. The reversal of 256673390 is 93376652.

It is an interprime number because it is at equal distance from previous prime (256673387) and next prime (256673393).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256673393) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7715 + ... + 23934.

It is an arithmetic number, because the mean of its divisors is an integer number (28912275).

Almost surely, 2^256673390 is an apocalyptic number.

256673390 is a deficient number, since it is larger than the sum of its proper divisors (205923010).

256673390 is a wasteful number, since it uses less digits than its factorization.

256673390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32467.

The product of its (nonzero) digits is 204120, while the sum is 41.

The square root of 256673390 is about 16021.0296173498. The cubic root of 256673390 is about 635.5166729250.

The spelling of 256673390 in words is "two hundred fifty-six million, six hundred seventy-three thousand, three hundred ninety".