71513904 has 120 divisors (see below), whose sum is σ = 232207360. Its totient is φ = 18564480.

The previous prime is 71513887. The next prime is 71513941. The reversal of 71513904 is 40931517.

It is a super-2 number, since 2×71513904² = 10228476930642432, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 39777 + ... + 41535.

Almost surely, 2^71513904 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 71513904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (116103680).

71513904 is an abundant number, since it is smaller than the sum of its proper divisors (160693456).

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

71513904 is a wasteful number, since it uses less digits than its factorization.

71513904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1799 (or 1782 counting only the distinct ones).

The product of its (nonzero) digits is 3780, while the sum is 30.

The square root of 71513904 is about 8456.5893834335. The cubic root of 71513904 is about 415.0784271384.

The spelling of 71513904 in words is "seventy-one million, five hundred thirteen thousand, nine hundred four".