72989669 has 4 divisors (see below), whose sum is σ = 73148460. Its totient is φ = 72830880.

The previous prime is 72989629. The next prime is 72989677. The reversal of 72989669 is 96698927.

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

It can be written as a sum of positive squares in 2 ways, for example, as 49350625 + 23639044 = 7025^2 + 4862^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72989669 is a prime.

It is a super-2 number, since 2×72989669² = 10654983561459122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72989629) 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, 78704 + ... + 79625.

It is an arithmetic number, because the mean of its divisors is an integer number (18287115).

Almost surely, 2^72989669 is an apocalyptic number.

It is an amenable number.

72989669 is a deficient number, since it is larger than the sum of its proper divisors (158791).

72989669 is a wasteful number, since it uses less digits than its factorization.

72989669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158790.

The product of its digits is 2939328, while the sum is 56.

The square root of 72989669 is about 8543.3991478802. The cubic root of 72989669 is about 417.9142032956.

The spelling of 72989669 in words is "seventy-two million, nine hundred eighty-nine thousand, six hundred sixty-nine".