56720209 has 8 divisors (see below), whose sum is σ = 69809600. Its totient is φ = 44877456.

The previous prime is 56720207. The next prime is 56720239. The reversal of 56720209 is 90202765.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56720209 - 2¹ = 56720207 is a prime.

It is not an unprimeable number, because it can be changed into a prime (56720203) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 311559 + ... + 311740.

It is an arithmetic number, because the mean of its divisors is an integer number (8726200).

Almost surely, 2^56720209 is an apocalyptic number.

It is an amenable number.

56720209 is a deficient number, since it is larger than the sum of its proper divisors (13089391).

56720209 is a wasteful number, since it uses less digits than its factorization.

56720209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 623319.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 56720209 is about 7531.2820289775. The cubic root of 56720209 is about 384.2193864457.

The spelling of 56720209 in words is "fifty-six million, seven hundred twenty thousand, two hundred nine".