86783979 has 16 divisors (see below), whose sum is σ = 119941920. Its totient is φ = 55749120.

The previous prime is 86783969. The next prime is 86783993. The reversal of 86783979 is 97938768.

It is not a de Polignac number, because 86783979 - 2⁹ = 86783467 is a prime.

It is a super-2 number, since 2×86783979² = 15062918022144882, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (86783969) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 84489 + ... + 85509.

It is an arithmetic number, because the mean of its divisors is an integer number (7496370).

Almost surely, 2^86783979 is an apocalyptic number.

86783979 is a deficient number, since it is larger than the sum of its proper divisors (33157941).

86783979 is a wasteful number, since it uses less digits than its factorization.

86783979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2030.

The product of its digits is 4572288, while the sum is 57.

The square root of 86783979 is about 9315.7919148079. The cubic root of 86783979 is about 442.7377151675.

The spelling of 86783979 in words is "eighty-six million, seven hundred eighty-three thousand, nine hundred seventy-nine".