71715138 has 64 divisors (see below), whose sum is σ = 162846720. Its totient is φ = 20865600.

The previous prime is 71715113. The next prime is 71715179. The reversal of 71715138 is 83151717.

It is a super-2 number, since 2×71715138² = 10286122036718088, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 71715099 and 71715108.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 189033 + ... + 189411.

It is an arithmetic number, because the mean of its divisors is an integer number (2544480).

Almost surely, 2^71715138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71715138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81423360).

71715138 is an abundant number, since it is smaller than the sum of its proper divisors (91131582).

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

71715138 is a wasteful number, since it uses less digits than its factorization.

71715138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 503.

The product of its digits is 5880, while the sum is 33.

The square root of 71715138 is about 8468.4790842276. The cubic root of 71715138 is about 415.4673942391.

The spelling of 71715138 in words is "seventy-one million, seven hundred fifteen thousand, one hundred thirty-eight".