256620430 has 48 divisors (see below), whose sum is σ = 529859232. Its totient is φ = 89249600.

The previous prime is 256620421. The next prime is 256620439. The reversal of 256620430 is 34026652.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (256620421) and next prime (256620439).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256620439) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23220 + ... + 32440.

It is an arithmetic number, because the mean of its divisors is an integer number (11038734).

Almost surely, 2^256620430 is an apocalyptic number.

256620430 is an abundant number, since it is smaller than the sum of its proper divisors (273238802).

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

256620430 is a wasteful number, since it uses less digits than its factorization.

256620430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9273 (or 9262 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 28.

The square root of 256620430 is about 16019.3767044789. The cubic root of 256620430 is about 635.4729607219.

The spelling of 256620430 in words is "two hundred fifty-six million, six hundred twenty thousand, four hundred thirty".