86840557 has 4 divisors (see below), whose sum is σ = 87178716. Its totient is φ = 86502400.

The previous prime is 86840549. The next prime is 86840561. The reversal of 86840557 is 75504868.

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 45508516 + 41332041 = 6746^2 + 6429^2 .

It is a cyclic number.

It is not a de Polignac number, because 86840557 - 2³ = 86840549 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 (86840527) 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, 168694 + ... + 169207.

It is an arithmetic number, because the mean of its divisors is an integer number (21794679).

Almost surely, 2^86840557 is an apocalyptic number.

It is an amenable number.

86840557 is a deficient number, since it is larger than the sum of its proper divisors (338159).

86840557 is a wasteful number, since it uses less digits than its factorization.

86840557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 338158.

The product of its (nonzero) digits is 268800, while the sum is 43.

The square root of 86840557 is about 9318.8280915574. The cubic root of 86840557 is about 442.8339071650.

The spelling of 86840557 in words is "eighty-six million, eight hundred forty thousand, five hundred fifty-seven".