86787831 has 16 divisors (see below), whose sum is σ = 125153280. Its totient is φ = 53178720.

The previous prime is 86787791. The next prime is 86787859. The reversal of 86787831 is 13878768.

It is not a de Polignac number, because 86787831 - 2⁹ = 86787319 is a prime.

It is a super-2 number, since 2×86787831² = 15064255219369122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86787031) 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, 4666 + ... + 13976.

It is an arithmetic number, because the mean of its divisors is an integer number (7822080).

Almost surely, 2^86787831 is an apocalyptic number.

86787831 is a deficient number, since it is larger than the sum of its proper divisors (38365449).

86787831 is a wasteful number, since it uses less digits than its factorization.

86787831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9566.

The product of its digits is 451584, while the sum is 48.

The square root of 86787831 is about 9315.9986582223. The cubic root of 86787831 is about 442.7442655334.

The spelling of 86787831 in words is "eighty-six million, seven hundred eighty-seven thousand, eight hundred thirty-one".