86618557 has 4 divisors (see below), whose sum is σ = 89412736. Its totient is φ = 83824380.

The previous prime is 86618537. The next prime is 86618569. The reversal of 86618557 is 75581668.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86618557 - 2¹⁹ = 86094269 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 (86618537) 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, 1397043 + ... + 1397104.

It is an arithmetic number, because the mean of its divisors is an integer number (22353184).

Almost surely, 2^86618557 is an apocalyptic number.

It is an amenable number.

86618557 is a deficient number, since it is larger than the sum of its proper divisors (2794179).

86618557 is a wasteful number, since it uses less digits than its factorization.

86618557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2794178.

The product of its digits is 403200, while the sum is 46.

The square root of 86618557 is about 9306.9091002330. The cubic root of 86618557 is about 442.4562302563.

The spelling of 86618557 in words is "eighty-six million, six hundred eighteen thousand, five hundred fifty-seven".