86720197 has 4 divisors (see below), whose sum is σ = 86751756. Its totient is φ = 86688640.

The previous prime is 86720191. The next prime is 86720201. The reversal of 86720197 is 79102768.

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 81108036 + 5612161 = 9006^2 + 2369^2 .

It is a cyclic number.

It is not a de Polignac number, because 86720197 - 2⁷ = 86720069 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 (86720191) 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, 11218 + ... + 17299.

It is an arithmetic number, because the mean of its divisors is an integer number (21687939).

Almost surely, 2^86720197 is an apocalyptic number.

It is an amenable number.

86720197 is a deficient number, since it is larger than the sum of its proper divisors (31559).

86720197 is a wasteful number, since it uses less digits than its factorization.

86720197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31558.

The product of its (nonzero) digits is 42336, while the sum is 40.

The square root of 86720197 is about 9312.3679587954. The cubic root of 86720197 is about 442.6292250286.

The spelling of 86720197 in words is "eighty-six million, seven hundred twenty thousand, one hundred ninety-seven".