72788669 has 4 divisors (see below), whose sum is σ = 73065696. Its totient is φ = 72511644.

The previous prime is 72788641. The next prime is 72788671. The reversal of 72788669 is 96688727.

It is a happy number.

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.

It is a cyclic number.

It is not a de Polignac number, because 72788669 - 2⁸ = 72788413 is a prime.

It is a super-2 number, since 2×72788669² = 10596380669583122, which contains 22 as substring.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a self number, because there is not a number n which added to its sum of digits gives 72788669.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72788609) 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, 138119 + ... + 138644.

It is an arithmetic number, because the mean of its divisors is an integer number (18266424).

Almost surely, 2^72788669 is an apocalyptic number.

It is an amenable number.

72788669 is a deficient number, since it is larger than the sum of its proper divisors (277027).

72788669 is a wasteful number, since it uses less digits than its factorization.

72788669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 277026.

The product of its digits is 2032128, while the sum is 53.

The square root of 72788669 is about 8531.6275703994. The cubic root of 72788669 is about 417.5302312363.

The spelling of 72788669 in words is "seventy-two million, seven hundred eighty-eight thousand, six hundred sixty-nine".