86778387 has 12 divisors (see below), whose sum is σ = 132720120. Its totient is φ = 54449088.

The previous prime is 86778371. The next prime is 86778389. The reversal of 86778387 is 78387768.

It is not a de Polignac number, because 86778387 - 2⁴ = 86778371 is a prime.

It is not an unprimeable number, because it can be changed into a prime (86778389) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 283437 + ... + 283742.

It is an arithmetic number, because the mean of its divisors is an integer number (11060010).

Almost surely, 2^86778387 is an apocalyptic number.

86778387 is a deficient number, since it is larger than the sum of its proper divisors (45941733).

86778387 is a wasteful number, since it uses less digits than its factorization.

86778387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 567202 (or 567199 counting only the distinct ones).

The product of its digits is 3161088, while the sum is 54.

The square root of 86778387 is about 9315.4917744583. The cubic root of 86778387 is about 442.7282055686.

The spelling of 86778387 in words is "eighty-six million, seven hundred seventy-eight thousand, three hundred eighty-seven".