72399669 has 4 divisors (see below), whose sum is σ = 96532896. Its totient is φ = 48266444.

The previous prime is 72399641. The next prime is 72399697. The reversal of 72399669 is 96699327.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 96699327 = 3 ⋅32233109.

It is an interprime number because it is at equal distance from previous prime (72399641) and next prime (72399697).

It is a cyclic number.

It is not a de Polignac number, because 72399669 - 2⁵ = 72399637 is a prime.

It is a super-2 number, since 2×72399669² = 10483424142619122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72399869) 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 3 ways as a sum of consecutive naturals, for example, 12066609 + ... + 12066614.

It is an arithmetic number, because the mean of its divisors is an integer number (24133224).

Almost surely, 2^72399669 is an apocalyptic number.

It is an amenable number.

72399669 is a deficient number, since it is larger than the sum of its proper divisors (24133227).

72399669 is a wasteful number, since it uses less digits than its factorization.

72399669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24133226.

The product of its digits is 1102248, while the sum is 51.

The square root of 72399669 is about 8508.7995040429. The cubic root of 72399669 is about 416.7851085862.

The spelling of 72399669 in words is "seventy-two million, three hundred ninety-nine thousand, six hundred sixty-nine".