86978787 has 8 divisors (see below), whose sum is σ = 132539136. Its totient is φ = 49702152.

The previous prime is 86978761. The next prime is 86978807. The reversal of 86978787 is 78787968.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 86978787 - 2⁸ = 86978531 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 86978787.

It is not an unprimeable number, because it can be changed into a prime (86978707) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2070903 + ... + 2070944.

It is an arithmetic number, because the mean of its divisors is an integer number (16567392).

Almost surely, 2^86978787 is an apocalyptic number.

86978787 is a deficient number, since it is larger than the sum of its proper divisors (45560349).

86978787 is a wasteful number, since it uses less digits than its factorization.

86978787 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4141857.

The product of its digits is 9483264, while the sum is 60.

The square root of 86978787 is about 9326.2418476040. The cubic root of 86978787 is about 443.0687455204.

The spelling of 86978787 in words is "eighty-six million, nine hundred seventy-eight thousand, seven hundred eighty-seven".