56735721 has 40 divisors (see below), whose sum is σ = 98968320. Its totient is φ = 31715712.

The previous prime is 56735719. The next prime is 56735737. The reversal of 56735721 is 12753765.

It is not a de Polignac number, because 56735721 - 2¹ = 56735719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56735711) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 25585 + ... + 27713.

It is an arithmetic number, because the mean of its divisors is an integer number (2474208).

Almost surely, 2^56735721 is an apocalyptic number.

It is an amenable number.

56735721 is a deficient number, since it is larger than the sum of its proper divisors (42232599).

56735721 is a wasteful number, since it uses less digits than its factorization.

56735721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2195 (or 2186 counting only the distinct ones).

The product of its digits is 44100, while the sum is 36.

The square root of 56735721 is about 7532.3117965204. The cubic root of 56735721 is about 384.2544090475.

The spelling of 56735721 in words is "fifty-six million, seven hundred thirty-five thousand, seven hundred twenty-one".