256250040 has 32 divisors (see below), whose sum is σ = 768750480. Its totient is φ = 68333312.

The previous prime is 256250023. The next prime is 256250047. The reversal of 256250040 is 40052652.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (256250047) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1067589 + ... + 1067828.

Almost surely, 2^256250040 is an apocalyptic number.

256250040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256250040 is an abundant number, since it is smaller than the sum of its proper divisors (512500440).

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

256250040 is a wasteful number, since it uses less digits than its factorization.

256250040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2135431 (or 2135427 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 256250040 is about 16007.8118429722. The cubic root of 256250040 is about 635.1670794356.

The spelling of 256250040 in words is "two hundred fifty-six million, two hundred fifty thousand, forty".