86681977 has 4 divisors (see below), whose sum is σ = 88317540. Its totient is φ = 85046416.

The previous prime is 86681953. The next prime is 86681981. The reversal of 86681977 is 77918668.

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 30791401 + 55890576 = 5549^2 + 7476^2 .

It is a cyclic number.

It is not a de Polignac number, because 86681977 - 2¹⁵ = 86649209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86681927) 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, 817702 + ... + 817807.

It is an arithmetic number, because the mean of its divisors is an integer number (22079385).

Almost surely, 2^86681977 is an apocalyptic number.

It is an amenable number.

86681977 is a deficient number, since it is larger than the sum of its proper divisors (1635563).

86681977 is a wasteful number, since it uses less digits than its factorization.

86681977 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1635562.

The product of its digits is 1016064, while the sum is 52.

The square root of 86681977 is about 9310.3156230066. The cubic root of 86681977 is about 442.5641891412.

The spelling of 86681977 in words is "eighty-six million, six hundred eighty-one thousand, nine hundred seventy-seven".