56628761 has 6 divisors (see below), whose sum is σ = 65874330. Its totient is φ = 48538896.

The previous prime is 56628743. The next prime is 56628763. The reversal of 56628761 is 16782665.

It can be written as a sum of positive squares in only one way, i.e., 56625625 + 3136 = 7525^2 + 56^2 .

It is not a de Polignac number, because 56628761 - 2¹⁸ = 56366617 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56628763) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 577796 + ... + 577893.

It is an arithmetic number, because the mean of its divisors is an integer number (10979055).

Almost surely, 2^56628761 is an apocalyptic number.

It is an amenable number.

56628761 is a deficient number, since it is larger than the sum of its proper divisors (9245569).

56628761 is a wasteful number, since it uses less digits than its factorization.

56628761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1155703 (or 1155696 counting only the distinct ones).

The product of its digits is 120960, while the sum is 41.

The square root of 56628761 is about 7525.2083692081. The cubic root of 56628761 is about 384.0127875697.

The spelling of 56628761 in words is "fifty-six million, six hundred twenty-eight thousand, seven hundred sixty-one".