256773540 has 48 divisors (see below), whose sum is σ = 743762880. Its totient is φ = 66111360.

The previous prime is 256773469. The next prime is 256773563. The reversal of 256773540 is 45377652.

256773540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72046 + ... + 75525.

It is an arithmetic number, because the mean of its divisors is an integer number (15495060).

Almost surely, 2^256773540 is an apocalyptic number.

256773540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256773540 is an abundant number, since it is smaller than the sum of its proper divisors (486989340).

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

256773540 is a wasteful number, since it uses less digits than its factorization.

256773540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 147612 (or 147610 counting only the distinct ones).

The product of its (nonzero) digits is 176400, while the sum is 39.

The square root of 256773540 is about 16024.1548919124. The cubic root of 256773540 is about 635.5993184466.

The spelling of 256773540 in words is "two hundred fifty-six million, seven hundred seventy-three thousand, five hundred forty".