71722690 has 16 divisors (see below), whose sum is σ = 139031928. Its totient is φ = 26482176.

The previous prime is 71722661. The next prime is 71722691. The reversal of 71722690 is 9622717.

It can be written as a sum of positive squares in 4 ways, for example, as 20985561 + 50737129 = 4581^2 + 7123^2 .

It is a super-2 number, since 2×71722690² = 10288288521672200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (71722691) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 275727 + ... + 275986.

Almost surely, 2^71722690 is an apocalyptic number.

71722690 is a deficient number, since it is larger than the sum of its proper divisors (67309238).

71722690 is a wasteful number, since it uses less digits than its factorization.

71722690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551733.

The product of its (nonzero) digits is 10584, while the sum is 34.

The square root of 71722690 is about 8468.9249612923. The cubic root of 71722690 is about 415.4819773974.

The spelling of 71722690 in words is "seventy-one million, seven hundred twenty-two thousand, six hundred ninety".