71309124 has 18 divisors (see below), whose sum is σ = 180253710. Its totient is φ = 23769696.

The previous prime is 71309123. The next prime is 71309129. The reversal of 71309124 is 42190317.

It can be written as a sum of positive squares in only one way, i.e., 48441600 + 22867524 = 6960^2 + 4782^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is not an unprimeable number, because it can be changed into a prime (71309123) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 990369 + ... + 990440.

It is an arithmetic number, because the mean of its divisors is an integer number (10014095).

Almost surely, 2^71309124 is an apocalyptic number.

It is an amenable number.

71309124 is an abundant number, since it is smaller than the sum of its proper divisors (108944586).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

71309124 is a wasteful number, since it uses less digits than its factorization.

71309124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1980819 (or 1980814 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 71309124 is about 8444.4729853319. The cubic root of 71309124 is about 414.6818561356.

The spelling of 71309124 in words is "seventy-one million, three hundred nine thousand, one hundred twenty-four".