56821740 has 48 divisors (see below), whose sum is σ = 161292768. Its totient is φ = 14943744.

The previous prime is 56821703. The next prime is 56821741. The reversal of 56821740 is 4712865.

It is not an unprimeable number, because it can be changed into a prime (56821741) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2107 + ... + 10866.

It is an arithmetic number, because the mean of its divisors is an integer number (3360266).

Almost surely, 2^56821740 is an apocalyptic number.

It is an amenable number.

56821740 is an abundant number, since it is smaller than the sum of its proper divisors (104471028).

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

56821740 is a wasteful number, since it uses less digits than its factorization.

56821740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13058 (or 13056 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 33.

The square root of 56821740 is about 7538.0196338296. The cubic root of 56821740 is about 384.4485048137.

The spelling of 56821740 in words is "fifty-six million, eight hundred twenty-one thousand, seven hundred forty".