86780811 has 32 divisors (see below), whose sum is σ = 129669120. Its totient is φ = 51264000.

The previous prime is 86780803. The next prime is 86780821. The reversal of 86780811 is 11808768.

It is not a de Polignac number, because 86780811 - 2³ = 86780803 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 86780811.

It is not an unprimeable number, because it can be changed into a prime (86780821) 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 31 ways as a sum of consecutive naturals, for example, 216211 + ... + 216611.

It is an arithmetic number, because the mean of its divisors is an integer number (4052160).

Almost surely, 2^86780811 is an apocalyptic number.

86780811 is a deficient number, since it is larger than the sum of its proper divisors (42888309).

86780811 is a wasteful number, since it uses less digits than its factorization.

86780811 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627.

The product of its (nonzero) digits is 21504, while the sum is 39.

The square root of 86780811 is about 9315.6218794024. The cubic root of 86780811 is about 442.7323278054.

The spelling of 86780811 in words is "eighty-six million, seven hundred eighty thousand, eight hundred eleven".