256977380 has 36 divisors (see below), whose sum is σ = 593177340. Its totient is φ = 93445440.

The previous prime is 256977373. The next prime is 256977397. The reversal of 256977380 is 83779652.

256977380 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82156096 + 174821284 = 9064^2 + 13222^2 .

It is a super-3 number, since 3×256977380³ (a number of 26 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50675 + ... + 55514.

Almost surely, 2^256977380 is an apocalyptic number.

256977380 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256977380 is an abundant number, since it is smaller than the sum of its proper divisors (336199960).

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

256977380 is a wasteful number, since it uses less digits than its factorization.

256977380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106220 (or 106207 counting only the distinct ones).

The product of its (nonzero) digits is 635040, while the sum is 47.

The square root of 256977380 is about 16030.5140279406. The cubic root of 256977380 is about 635.7674644015.

The spelling of 256977380 in words is "two hundred fifty-six million, nine hundred seventy-seven thousand, three hundred eighty".