71905690 has 32 divisors (see below), whose sum is σ = 136768320. Its totient is φ = 27143424.

The previous prime is 71905679. The next prime is 71905711. The reversal of 71905690 is 9650917.

It is a super-2 number, since 2×71905690² = 10340856508752200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (37) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax 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 15 ways as a sum of consecutive naturals, for example, 63469 + ... + 64591.

It is an arithmetic number, because the mean of its divisors is an integer number (4274010).

Almost surely, 2^71905690 is an apocalyptic number.

71905690 is a deficient number, since it is larger than the sum of its proper divisors (64862630).

71905690 is a wasteful number, since it uses less digits than its factorization.

71905690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1486.

The product of its (nonzero) digits is 17010, while the sum is 37.

The square root of 71905690 is about 8479.7222831883. The cubic root of 71905690 is about 415.8350438504.

It can be divided in two parts, 7190 and 5690, that added together give a triangular number (12880 = T₁₆₀).

The spelling of 71905690 in words is "seventy-one million, nine hundred five thousand, six hundred ninety".