86731970 has 32 divisors (see below), whose sum is σ = 168542640. Its totient is φ = 31944960.

The previous prime is 86731963. The next prime is 86732027. The reversal of 86731970 is 7913768.

It is a Cunningham number, because it is equal to 9313²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 11580409 + 75151561 = 3403^2 + 8669^2 .

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 91700 + ... + 92640.

Almost surely, 2^86731970 is an apocalyptic number.

86731970 is a deficient number, since it is larger than the sum of its proper divisors (81810670).

86731970 is a wasteful number, since it uses less digits than its factorization.

86731970 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1670.

The product of its (nonzero) digits is 63504, while the sum is 41.

The square root of 86731970 is about 9313.0000536884. Note that the first 4 decimals coincide. The cubic root of 86731970 is about 442.6492543422.

The spelling of 86731970 in words is "eighty-six million, seven hundred thirty-one thousand, nine hundred seventy".