86778811 has 4 divisors (see below), whose sum is σ = 99175792. Its totient is φ = 74381832.

The previous prime is 86778803. The next prime is 86778841. The reversal of 86778811 is 11887768.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 86778811 - 2³ = 86778803 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (86778841) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6198480 + ... + 6198493.

It is an arithmetic number, because the mean of its divisors is an integer number (24793948).

Almost surely, 2^86778811 is an apocalyptic number.

86778811 is a deficient number, since it is larger than the sum of its proper divisors (12396981).

86778811 is a wasteful number, since it uses less digits than its factorization.

86778811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12396980.

The product of its digits is 150528, while the sum is 46.

The square root of 86778811 is about 9315.5145322199. The cubic root of 86778811 is about 442.7289266255.

The spelling of 86778811 in words is "eighty-six million, seven hundred seventy-eight thousand, eight hundred eleven".