72678589 has 4 divisors (see below), whose sum is σ = 73055356. Its totient is φ = 72301824.

The previous prime is 72678577. The next prime is 72678607. The reversal of 72678589 is 98587627.

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 38068900 + 34609689 = 6170^2 + 5883^2 .

It is a cyclic number.

It is not a de Polignac number, because 72678589 - 2⁷ = 72678461 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72678509) 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, 188094 + ... + 188479.

It is an arithmetic number, because the mean of its divisors is an integer number (18263839).

Almost surely, 2^72678589 is an apocalyptic number.

It is an amenable number.

72678589 is a deficient number, since it is larger than the sum of its proper divisors (376767).

72678589 is a wasteful number, since it uses less digits than its factorization.

72678589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 376766.

The product of its digits is 1693440, while the sum is 52.

The square root of 72678589 is about 8525.1738398698. The cubic root of 72678589 is about 417.3196448101.

The spelling of 72678589 in words is "seventy-two million, six hundred seventy-eight thousand, five hundred eighty-nine".