72168987 has 16 divisors (see below), whose sum is σ = 106956288. Its totient is φ = 42912480.

The previous prime is 72168953. The next prime is 72168989. The reversal of 72168987 is 78986127.

It is not a de Polignac number, because 72168987 - 2²⁴ = 55391771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72168989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18883 + ... + 22380.

It is an arithmetic number, because the mean of its divisors is an integer number (6684768).

Almost surely, 2^72168987 is an apocalyptic number.

72168987 is a deficient number, since it is larger than the sum of its proper divisors (34787301).

72168987 is a wasteful number, since it uses less digits than its factorization.

72168987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41330.

The product of its digits is 338688, while the sum is 48.

The square root of 72168987 is about 8495.2331927970. The cubic root of 72168987 is about 416.3419798719.

The spelling of 72168987 in words is "seventy-two million, one hundred sixty-eight thousand, nine hundred eighty-seven".