86991629 has 4 divisors (see below), whose sum is σ = 87011676. Its totient is φ = 86971584.

The previous prime is 86991613. The next prime is 86991643. The reversal of 86991629 is 92619968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71859529 + 15132100 = 8477^2 + 3890^2 .

It is a cyclic number.

It is not a de Polignac number, because 86991629 - 2⁴ = 86991613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86991649) 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, 494 + ... + 13199.

It is an arithmetic number, because the mean of its divisors is an integer number (21752919).

Almost surely, 2^86991629 is an apocalyptic number.

It is an amenable number.

86991629 is a deficient number, since it is larger than the sum of its proper divisors (20047).

86991629 is a wasteful number, since it uses less digits than its factorization.

86991629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20046.

The product of its digits is 419904, while the sum is 50.

The square root of 86991629 is about 9326.9303095928. The cubic root of 86991629 is about 443.0905501045.

The spelling of 86991629 in words is "eighty-six million, nine hundred ninety-one thousand, six hundred twenty-nine".