86644157 has 4 divisors (see below), whose sum is σ = 87123036. Its totient is φ = 86165280.

The previous prime is 86644153. The next prime is 86644169. The reversal of 86644157 is 75144668.

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 6255001 + 80389156 = 2501^2 + 8966^2 .

It is a cyclic number.

It is not a de Polignac number, because 86644157 - 2² = 86644153 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 (86644153) 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, 239168 + ... + 239529.

It is an arithmetic number, because the mean of its divisors is an integer number (21780759).

Almost surely, 2^86644157 is an apocalyptic number.

It is an amenable number.

86644157 is a deficient number, since it is larger than the sum of its proper divisors (478879).

86644157 is a wasteful number, since it uses less digits than its factorization.

86644157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 478878.

The product of its digits is 161280, while the sum is 41.

The square root of 86644157 is about 9308.2843209691. The cubic root of 86644157 is about 442.4998150807.

It can be divided in two parts, 8664 and 4157, that added together give a palindrome (12821).

The spelling of 86644157 in words is "eighty-six million, six hundred forty-four thousand, one hundred fifty-seven".