56381640 has 64 divisors (see below), whose sum is σ = 193311360. Its totient is φ = 12887040.

The previous prime is 56381609. The next prime is 56381659. The reversal of 56381640 is 4618365.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32721 + ... + 34400.

It is an arithmetic number, because the mean of its divisors is an integer number (3020490).

Almost surely, 2^56381640 is an apocalyptic number.

It is an amenable number.

56381640 is an abundant number, since it is smaller than the sum of its proper divisors (136929720).

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

56381640 is a wasteful number, since it uses less digits than its factorization.

56381640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67142 (or 67138 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 33.

The square root of 56381640 is about 7508.7708714543. The cubic root of 56381640 is about 383.4533780718.

The spelling of 56381640 in words is "fifty-six million, three hundred eighty-one thousand, six hundred forty".