56813820 has 48 divisors (see below), whose sum is σ = 181805568. Its totient is φ = 12985920.

The previous prime is 56813807. The next prime is 56813821. The reversal of 56813820 is 2831865.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56813821) 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, 67216 + ... + 68055.

It is an arithmetic number, because the mean of its divisors is an integer number (3787616).

Almost surely, 2^56813820 is an apocalyptic number.

It is an amenable number.

56813820 is an abundant number, since it is smaller than the sum of its proper divisors (124991748).

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

56813820 is a wasteful number, since it uses less digits than its factorization.

56813820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135290 (or 135288 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The square root of 56813820 is about 7537.4942786048. The cubic root of 56813820 is about 384.4306420870.

The spelling of 56813820 in words is "fifty-six million, eight hundred thirteen thousand, eight hundred twenty".