71686356 has 48 divisors (see below), whose sum is σ = 192307584. Its totient is φ = 20359296.

The previous prime is 71686339. The next prime is 71686379. The reversal of 71686356 is 65368617.

71686356 = T₆₃ + T₆₄ + ... + T₇₅₄.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

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, 12066 + ... + 16998.

It is an arithmetic number, because the mean of its divisors is an integer number (4006408).

Almost surely, 2^71686356 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 71686356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (96153792).

71686356 is an abundant number, since it is smaller than the sum of its proper divisors (120621228).

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

71686356 is a wasteful number, since it uses less digits than its factorization.

71686356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5120 (or 5118 counting only the distinct ones).

The product of its digits is 181440, while the sum is 42.

The square root of 71686356 is about 8466.7795530532. The cubic root of 71686356 is about 415.4118058702.

The spelling of 71686356 in words is "seventy-one million, six hundred eighty-six thousand, three hundred fifty-six".