72988669 has 8 divisors (see below), whose sum is σ = 78890840. Its totient is φ = 67127616.

The previous prime is 72988631. The next prime is 72988687. The reversal of 72988669 is 96688927.

It can be written as a sum of positive squares in 4 ways, for example, as 1923769 + 71064900 = 1387^2 + 8430^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 72988669 - 2¹⁵ = 72955901 is a prime.

It is a super-2 number, since 2×72988669² = 10654691604783122, 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 (72988609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6534 + ... + 13735.

It is an arithmetic number, because the mean of its divisors is an integer number (9861355).

Almost surely, 2^72988669 is an apocalyptic number.

72988669 is the 4933-rd hex number.

It is an amenable number.

72988669 is a deficient number, since it is larger than the sum of its proper divisors (5902171).

72988669 is a wasteful number, since it uses less digits than its factorization.

72988669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20559.

The product of its digits is 2612736, while the sum is 55.

The square root of 72988669 is about 8543.3406229648. The cubic root of 72988669 is about 417.9122947327.

It can be divided in two parts, 729 and 88669, that added together give a palindrome (89398).

The spelling of 72988669 in words is "seventy-two million, nine hundred eighty-eight thousand, six hundred sixty-nine".