86891429690 has 32 divisors (see below), whose sum is σ = 178343681040. Its totient is φ = 30195753984.

The previous prime is 86891429671. The next prime is 86891429699. The reversal of 86891429690 is 9692419868.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 65295069841 + 21596359849 = 255529^2 + 146957^2 .

It is a super-2 number, since 2×86891429690² (a number of 23 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (62) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (86891429699) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19656485 + ... + 19660904.

Almost surely, 2^86891429690 is an apocalyptic number.

86891429690 is an abundant number, since it is smaller than the sum of its proper divisors (91452251350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

86891429690 is a wasteful number, since it uses less digits than its factorization.

86891429690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39317426.

The product of its (nonzero) digits is 13436928, while the sum is 62.

The spelling of 86891429690 in words is "eighty-six billion, eight hundred ninety-one million, four hundred twenty-nine thousand, six hundred ninety".