56109890 has 16 divisors (see below), whose sum is σ = 101090808. Its totient is φ = 22423296.

The previous prime is 56109863. The next prime is 56109899. The reversal of 56109890 is 9890165.

It can be written as a sum of positive squares in 4 ways, for example, as 12694969 + 43414921 = 3563^2 + 6589^2 .

It is an alternating number because its digits alternate between odd and even.

It is not an unprimeable number, because it can be changed into a prime (56109899) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 13724 + ... + 17336.

Almost surely, 2^56109890 is an apocalyptic number.

56109890 is a deficient number, since it is larger than the sum of its proper divisors (44980918).

56109890 is a wasteful number, since it uses less digits than its factorization.

56109890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5173.

The product of its (nonzero) digits is 19440, while the sum is 38.

The square root of 56109890 is about 7490.6535095411. The cubic root of 56109890 is about 382.8363254309.

The spelling of 56109890 in words is "fifty-six million, one hundred nine thousand, eight hundred ninety".