86991958 has 16 divisors (see below), whose sum is σ = 141899904. Its totient is φ = 39830400.

The previous prime is 86991913. The next prime is 86991977. The reversal of 86991958 is 85919968.

It is a junction number, because it is equal to n+sod(n) for n = 86991899 and 86991908.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33318 + ... + 35833.

It is an arithmetic number, because the mean of its divisors is an integer number (8868744).

Almost surely, 2^86991958 is an apocalyptic number.

86991958 is a deficient number, since it is larger than the sum of its proper divisors (54907946).

86991958 is a wasteful number, since it uses less digits than its factorization.

86991958 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69207.

The product of its digits is 1399680, while the sum is 55.

The square root of 86991958 is about 9326.9479466758. The cubic root of 86991958 is about 443.0911086893.

The spelling of 86991958 in words is "eighty-six million, nine hundred ninety-one thousand, nine hundred fifty-eight".