71521814 has 96 divisors (see below), whose sum is σ = 146868480. Its totient is φ = 25474176.

The previous prime is 71521799. The next prime is 71521843. The reversal of 71521814 is 41812517.

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 47 ways as a sum of consecutive naturals, for example, 1663277 + ... + 1663319.

It is an arithmetic number, because the mean of its divisors is an integer number (1529880).

Almost surely, 2^71521814 is an apocalyptic number.

71521814 is a gapful number since it is divisible by the number (74) formed by its first and last digit.

71521814 is an abundant number, since it is smaller than the sum of its proper divisors (75346666).

71521814 is a wasteful number, since it uses less digits than its factorization.

71521814 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134 (or 121 counting only the distinct ones).

The product of its digits is 2240, while the sum is 29.

The square root of 71521814 is about 8457.0570531362. The cubic root of 71521814 is about 415.0937302200.

The spelling of 71521814 in words is "seventy-one million, five hundred twenty-one thousand, eight hundred fourteen".