256607730 has 64 divisors (see below), whose sum is σ = 720316800. Its totient is φ = 64825920.

The previous prime is 256607723. The next prime is 256607759. The reversal of 256607730 is 37706652.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19881 + ... + 30140.

It is an arithmetic number, because the mean of its divisors is an integer number (11254950).

Almost surely, 2^256607730 is an apocalyptic number.

256607730 is an abundant number, since it is smaller than the sum of its proper divisors (463709070).

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

256607730 is a wasteful number, since it uses less digits than its factorization.

256607730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50056 (or 50050 counting only the distinct ones).

The product of its (nonzero) digits is 52920, while the sum is 36.

The square root of 256607730 is about 16018.9803046261. The cubic root of 256607730 is about 635.4624774831.

The spelling of 256607730 in words is "two hundred fifty-six million, six hundred seven thousand, seven hundred thirty".