71393904 has 30 divisors (see below), whose sum is σ = 199804176. Its totient is φ = 23797920.

The previous prime is 71393879. The next prime is 71393921. The reversal of 71393904 is 40939317.

It is a super-2 number, since 2×71393904² = 10194179056722432, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 247752 + ... + 248039.

Almost surely, 2^71393904 is an apocalyptic number.

It is an amenable number.

71393904 is an abundant number, since it is smaller than the sum of its proper divisors (128410272).

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

71393904 is a wasteful number, since it uses less digits than its factorization.

71393904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 495805 (or 495796 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The square root of 71393904 is about 8449.4913456373. The cubic root of 71393904 is about 414.8461305991.

The spelling of 71393904 in words is "seventy-one million, three hundred ninety-three thousand, nine hundred four".