256148388 has 18 divisors (see below), whose sum is σ = 647486294. Its totient is φ = 85382784.

The previous prime is 256148371. The next prime is 256148393. The reversal of 256148388 is 883841652.

256148388 is a `hidden beast` number, since 2 + 561 + 4 + 8 + 3 + 88 = 666.

It can be written as a sum of positive squares in only one way, i.e., 248629824 + 7518564 = 15768^2 + 2742^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×256148388² = 131223993349997088, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3557581 + ... + 3557652.

Almost surely, 2^256148388 is an apocalyptic number.

It is an amenable number.

256148388 is an abundant number, since it is smaller than the sum of its proper divisors (391337906).

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

256148388 is a wasteful number, since it uses less digits than its factorization.

256148388 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7115243 (or 7115238 counting only the distinct ones).

The product of its digits is 368640, while the sum is 45.

The square root of 256148388 is about 16004.6364532282. The cubic root of 256148388 is about 635.0830800426.

The spelling of 256148388 in words is "two hundred fifty-six million, one hundred forty-eight thousand, three hundred eighty-eight".