71915985 has 32 divisors (see below), whose sum is σ = 130032000. Its totient is φ = 37700928.

The previous prime is 71915983. The next prime is 71915989. The reversal of 71915985 is 58951917.

It is not a de Polignac number, because 71915985 - 2¹ = 71915983 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 71915985.

It is not an unprimeable number, because it can be changed into a prime (71915983) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3451 + ... + 12479.

It is an arithmetic number, because the mean of its divisors is an integer number (4063500).

Almost surely, 2^71915985 is an apocalyptic number.

It is an amenable number.

71915985 is a deficient number, since it is larger than the sum of its proper divisors (58116015).

71915985 is a wasteful number, since it uses less digits than its factorization.

71915985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9102 (or 9096 counting only the distinct ones).

The product of its digits is 113400, while the sum is 45.

The square root of 71915985 is about 8480.3292978516. The cubic root of 71915985 is about 415.8548884436.

It can be divided in two parts, 71915 and 985, that added together give a square (72900 = 270²).

The spelling of 71915985 in words is "seventy-one million, nine hundred fifteen thousand, nine hundred eighty-five".