71921895 has 16 divisors (see below), whose sum is σ = 118186080. Its totient is φ = 37321344.

The previous prime is 71921819. The next prime is 71921921. The reversal of 71921895 is 59812917.

It is not a de Polignac number, because 71921895 - 2⁸ = 71921639 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64240 + ... + 65349.

It is an arithmetic number, because the mean of its divisors is an integer number (7386630).

Almost surely, 2^71921895 is an apocalyptic number.

71921895 is a deficient number, since it is larger than the sum of its proper divisors (46264185).

71921895 is a wasteful number, since it uses less digits than its factorization.

71921895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129634.

The product of its digits is 45360, while the sum is 42.

The square root of 71921895 is about 8480.6777441429. The cubic root of 71921895 is about 415.8662796758.

The spelling of 71921895 in words is "seventy-one million, nine hundred twenty-one thousand, eight hundred ninety-five".