72579869 has 2 divisors, whose sum is σ = 72579870. Its totient is φ = 72579868.

The previous prime is 72579841. The next prime is 72579883. The reversal of 72579869 is 96897527.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51768025 + 20811844 = 7195^2 + 4562^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72579869 is a prime.

It is a super-2 number, since 2×72579869² = 10535674768114322, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 72579869.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (72579839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36289934 + 36289935.

It is an arithmetic number, because the mean of its divisors is an integer number (36289935).

Almost surely, 2^72579869 is an apocalyptic number.

It is an amenable number.

72579869 is a deficient number, since it is larger than the sum of its proper divisors (1).

72579869 is an equidigital number, since it uses as much as digits as its factorization.

72579869 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1905120, while the sum is 53.

The square root of 72579869 is about 8519.3819611519. The cubic root of 72579869 is about 417.1306094830.

The spelling of 72579869 in words is "seventy-two million, five hundred seventy-nine thousand, eight hundred sixty-nine".