72565723 has 4 divisors (see below), whose sum is σ = 73559848. Its totient is φ = 71571600.

The previous prime is 72565657. The next prime is 72565733. The reversal of 72565723 is 32756527.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 72565723 - 2¹⁷ = 72434651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (72565733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 496953 + ... + 497098.

It is an arithmetic number, because the mean of its divisors is an integer number (18389962).

Almost surely, 2^72565723 is an apocalyptic number.

72565723 is a gapful number since it is divisible by the number (73) formed by its first and last digit.

72565723 is a deficient number, since it is larger than the sum of its proper divisors (994125).

72565723 is an equidigital number, since it uses as much as digits as its factorization.

72565723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 994124.

The product of its digits is 88200, while the sum is 37.

The square root of 72565723 is about 8518.5516961512. The cubic root of 72565723 is about 417.1035077853.

The spelling of 72565723 in words is "seventy-two million, five hundred sixty-five thousand, seven hundred twenty-three".