82111690 has 8 divisors (see below), whose sum is σ = 147801060. Its totient is φ = 32844672.

The previous prime is 82111669. The next prime is 82111697. The reversal of 82111690 is 9611128.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 75846681 + 6265009 = 8709^2 + 2503^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×82111690² = 13484659269312200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (82111697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4105575 + ... + 4105594.

Almost surely, 2^82111690 is an apocalyptic number.

82111690 is a deficient number, since it is larger than the sum of its proper divisors (65689370).

82111690 is a wasteful number, since it uses less digits than its factorization.

82111690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8211176.

The product of its (nonzero) digits is 864, while the sum is 28.

The square root of 82111690 is about 9061.5500881472. The cubic root of 82111690 is about 434.6453091440.

The spelling of 82111690 in words is "eighty-two million, one hundred eleven thousand, six hundred ninety".