71991022 has 16 divisors (see below), whose sum is σ = 114685200. Its totient is φ = 33775488.

The previous prime is 71991001. The next prime is 71991037. The reversal of 71991022 is 22019917.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8833 + ... + 14899.

It is an arithmetic number, because the mean of its divisors is an integer number (7167825).

Almost surely, 2^71991022 is an apocalyptic number.

71991022 is a deficient number, since it is larger than the sum of its proper divisors (42694178).

71991022 is a wasteful number, since it uses less digits than its factorization.

71991022 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6435.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 71991022 is about 8484.7523240222. The cubic root of 71991022 is about 415.9994722318. Note that the first 3 decimals are identical.

The spelling of 71991022 in words is "seventy-one million, nine hundred ninety-one thousand, twenty-two".