256452440 has 32 divisors (see below), whose sum is σ = 577530000. Its totient is φ = 102489984.

The previous prime is 256452421. The next prime is 256452451. The reversal of 256452440 is 44254652.

256452440 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 256452397 and 256452406.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 59891 + ... + 64029.

Almost surely, 2^256452440 is an apocalyptic number.

256452440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256452440 is an abundant number, since it is smaller than the sum of its proper divisors (321077560).

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

256452440 is a wasteful number, since it uses less digits than its factorization.

256452440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5699 (or 5695 counting only the distinct ones).

The product of its (nonzero) digits is 38400, while the sum is 32.

The square root of 256452440 is about 16014.1325085064. The cubic root of 256452440 is about 635.3342650803.

The spelling of 256452440 in words is "two hundred fifty-six million, four hundred fifty-two thousand, four hundred forty".