56640771 has 24 divisors (see below), whose sum is σ = 90103104. Its totient is φ = 34000560.

The previous prime is 56640763. The next prime is 56640797. The reversal of 56640771 is 17704665.

56640771 is a `hidden beast` number, since 5 + 6 + 640 + 7 + 7 + 1 = 666.

It is not a de Polignac number, because 56640771 - 2³ = 56640763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56640271) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7920 + ... + 13266.

It is an arithmetic number, because the mean of its divisors is an integer number (3754296).

Almost surely, 2^56640771 is an apocalyptic number.

56640771 is a deficient number, since it is larger than the sum of its proper divisors (33462333).

56640771 is a wasteful number, since it uses less digits than its factorization.

56640771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5471 (or 5468 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 36.

The square root of 56640771 is about 7526.0063114510. The cubic root of 56640771 is about 384.0399331843.

The spelling of 56640771 in words is "fifty-six million, six hundred forty thousand, seven hundred seventy-one".