72399769 has 6 divisors (see below), whose sum is σ = 78397566. Its totient is φ = 66830400.

The previous prime is 72399763. The next prime is 72399781. The reversal of 72399769 is 96799327.

It can be written as a sum of positive squares in 3 ways, for example, as 149769 + 72250000 = 387^2 + 8500^2 .

It is not a de Polignac number, because 72399769 - 2⁵ = 72399737 is a prime.

It is a super-2 number, since 2×72399769² = 10483453102506722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72399763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 214032 + ... + 214369.

It is an arithmetic number, because the mean of its divisors is an integer number (13066261).

Almost surely, 2^72399769 is an apocalyptic number.

It is an amenable number.

72399769 is a deficient number, since it is larger than the sum of its proper divisors (5997797).

72399769 is a wasteful number, since it uses less digits than its factorization.

72399769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 428427 (or 428414 counting only the distinct ones).

The product of its digits is 1285956, while the sum is 52.

The square root of 72399769 is about 8508.8053803104. The cubic root of 72399769 is about 416.7853004770.

The spelling of 72399769 in words is "seventy-two million, three hundred ninety-nine thousand, seven hundred sixty-nine".