256787340 has 24 divisors (see below), whose sum is σ = 719004720. Its totient is φ = 68476608.

The previous prime is 256787303. The next prime is 256787359. The reversal of 256787340 is 43787652.

256787340 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 = 256787292 and 256787301.

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, 2139835 + ... + 2139954.

It is an arithmetic number, because the mean of its divisors is an integer number (29958530).

Almost surely, 2^256787340 is an apocalyptic number.

256787340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

256787340 is an abundant number, since it is smaller than the sum of its proper divisors (462217380).

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

256787340 is a wasteful number, since it uses less digits than its factorization.

256787340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4279801 (or 4279799 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 256787340 is about 16024.5854860586. The cubic root of 256787340 is about 635.6107047619.

The spelling of 256787340 in words is "two hundred fifty-six million, seven hundred eighty-seven thousand, three hundred forty".