56211640 has 32 divisors (see below), whose sum is σ = 126715680. Its totient is φ = 22442112.

The previous prime is 56211637. The next prime is 56211643. The reversal of 56211640 is 4611265.

It is an interprime number because it is at equal distance from previous prime (56211637) and next prime (56211643).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56211643) 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, 28114 + ... + 30046.

It is an arithmetic number, because the mean of its divisors is an integer number (3959865).

Almost surely, 2^56211640 is an apocalyptic number.

It is an amenable number.

56211640 is an abundant number, since it is smaller than the sum of its proper divisors (70504040).

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

56211640 is a wasteful number, since it uses less digits than its factorization.

56211640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2671 (or 2667 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 56211640 is about 7497.4422305210. The cubic root of 56211640 is about 383.0675982278.

The spelling of 56211640 in words is "fifty-six million, two hundred eleven thousand, six hundred forty".