86775821 has 8 divisors (see below), whose sum is σ = 95247264. Its totient is φ = 78401520.

The previous prime is 86775809. The next prime is 86775827. The reversal of 86775821 is 12857768.

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

It is a cyclic number.

It is not a de Polignac number, because 86775821 - 2²² = 82581517 is a prime.

It is a super-2 number, since 2×86775821² = 15060086220448082, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86775827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22406 + ... + 25991.

It is an arithmetic number, because the mean of its divisors is an integer number (11905908).

Almost surely, 2^86775821 is an apocalyptic number.

It is an amenable number.

86775821 is a deficient number, since it is larger than the sum of its proper divisors (8471443).

86775821 is a wasteful number, since it uses less digits than its factorization.

86775821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48571.

The product of its digits is 188160, while the sum is 44.

The square root of 86775821 is about 9315.3540458750. The cubic root of 86775821 is about 442.7238417640.

The spelling of 86775821 in words is "eighty-six million, seven hundred seventy-five thousand, eight hundred twenty-one".