56505278 has 16 divisors (see below), whose sum is σ = 89907840. Its totient is φ = 26559000.

The previous prime is 56505277. The next prime is 56505283. The reversal of 56505278 is 87250565.

It is a Harshad number since it is a multiple of its sum of digits (38).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56505277) 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 7 ways as a sum of consecutive naturals, for example, 698 + ... + 10653.

It is an arithmetic number, because the mean of its divisors is an integer number (5619240).

Almost surely, 2^56505278 is an apocalyptic number.

56505278 is a deficient number, since it is larger than the sum of its proper divisors (33402562).

56505278 is a wasteful number, since it uses less digits than its factorization.

56505278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11503.

The product of its (nonzero) digits is 84000, while the sum is 38.

The square root of 56505278 is about 7516.9992683251. Note that the first 3 decimals coincide. The cubic root of 56505278 is about 383.7334621357.

The spelling of 56505278 in words is "fifty-six million, five hundred five thousand, two hundred seventy-eight".