56491812 has 36 divisors (see below), whose sum is σ = 153784540. Its totient is φ = 17381952.

The previous prime is 56491811. The next prime is 56491819. The reversal of 56491812 is 21819465.

56491812 is a `hidden beast` number, since 5 + 649 + 1 + 8 + 1 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 44836416 = 3414^2 + 6696^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (56491811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 59887 + ... + 60822.

Almost surely, 2^56491812 is an apocalyptic number.

56491812 is a gapful number since it is divisible by the number (52) formed by its first and last digit.

It is an amenable number.

56491812 is an abundant number, since it is smaller than the sum of its proper divisors (97292728).

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

56491812 is a wasteful number, since it uses less digits than its factorization.

56491812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120732 (or 120727 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 56491812 is about 7516.1035117939. The cubic root of 56491812 is about 383.7029766925.

The spelling of 56491812 in words is "fifty-six million, four hundred ninety-one thousand, eight hundred twelve".