72688387 has 16 divisors (see below), whose sum is σ = 77023872. Its totient is φ = 68515200.

The previous prime is 72688381. The next prime is 72688403. The reversal of 72688387 is 78388627.

It is a cyclic number.

It is not a de Polignac number, because 72688387 - 2²³ = 64299779 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 72688387.

It is not an unprimeable number, because it can be changed into a prime (72688381) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 197878 + ... + 198244.

It is an arithmetic number, because the mean of its divisors is an integer number (4813992).

Almost surely, 2^72688387 is an apocalyptic number.

72688387 is a deficient number, since it is larger than the sum of its proper divisors (4335485).

72688387 is a wasteful number, since it uses less digits than its factorization.

72688387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558.

The product of its digits is 903168, while the sum is 49.

The square root of 72688387 is about 8525.7484715420. The cubic root of 72688387 is about 417.3383973029.

The spelling of 72688387 in words is "seventy-two million, six hundred eighty-eight thousand, three hundred eighty-seven".