56881778 has 6 divisors (see below), whose sum is σ = 85338669. Its totient is φ = 28435556.

The previous prime is 56881777. The next prime is 56881787. The reversal of 56881778 is 87718865.

It can be written as a sum of positive squares in 2 ways, for example, as 31550689 + 25331089 = 5617^2 + 5033^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=5333.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56881771) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 8000 + ... + 13332.

Almost surely, 2^56881778 is an apocalyptic number.

56881778 is a deficient number, since it is larger than the sum of its proper divisors (28456891).

56881778 is an frugal number, since it uses more digits than its factorization.

56881778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10668 (or 5335 counting only the distinct ones).

The product of its digits is 752640, while the sum is 50.

The square root of 56881778 is about 7542.0009281357. Note that the first 3 decimals coincide. The cubic root of 56881778 is about 384.5838602532.

Multiplying 56881778 by its sum of digits (50), we get a square (2844088900 = 53330²).

The spelling of 56881778 in words is "fifty-six million, eight hundred eighty-one thousand, seven hundred seventy-eight".