72147985 has 16 divisors (see below), whose sum is σ = 106557696. Its totient is φ = 45667008.

The previous prime is 72147967. The next prime is 72147991. The reversal of 72147985 is 58974127.

It is a cyclic number.

It is not a de Polignac number, because 72147985 - 2²¹ = 70050833 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78829 + ... + 79738.

It is an arithmetic number, because the mean of its divisors is an integer number (6659856).

Almost surely, 2^72147985 is an apocalyptic number.

It is an amenable number.

72147985 is a deficient number, since it is larger than the sum of its proper divisors (34409711).

72147985 is a wasteful number, since it uses less digits than its factorization.

72147985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 158592.

The product of its digits is 141120, while the sum is 43.

The square root of 72147985 is about 8493.9969978803. The cubic root of 72147985 is about 416.3015891955.

The spelling of 72147985 in words is "seventy-two million, one hundred forty-seven thousand, nine hundred eighty-five".