86731649 has 4 divisors (see below), whose sum is σ = 86863920. Its totient is φ = 86599380.

The previous prime is 86731639. The next prime is 86731661. The reversal of 86731649 is 94613768.

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 a de Polignac number, because none of the positive numbers 2^k-86731649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86731639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65147 + ... + 66464.

It is an arithmetic number, because the mean of its divisors is an integer number (21715980).

Almost surely, 2^86731649 is an apocalyptic number.

It is an amenable number.

86731649 is a deficient number, since it is larger than the sum of its proper divisors (132271).

86731649 is a wasteful number, since it uses less digits than its factorization.

86731649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132270.

The product of its digits is 217728, while the sum is 44.

The square root of 86731649 is about 9312.9828196985. The cubic root of 86731649 is about 442.6487082515.

The spelling of 86731649 in words is "eighty-six million, seven hundred thirty-one thousand, six hundred forty-nine".