86787919 has 4 divisors (see below), whose sum is σ = 86807344. Its totient is φ = 86768496.

The previous prime is 86787859. The next prime is 86787929. The reversal of 86787919 is 91978768.

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

It is a cyclic number.

It is not a de Polignac number, because 86787919 - 2⁷ = 86787791 is a prime.

It is a super-2 number, since 2×86787919² = 15064285768701122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86787919.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86787929) 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, 739 + ... + 13195.

It is an arithmetic number, because the mean of its divisors is an integer number (21701836).

Almost surely, 2^86787919 is an apocalyptic number.

86787919 is a deficient number, since it is larger than the sum of its proper divisors (19425).

86787919 is a wasteful number, since it uses less digits than its factorization.

86787919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19424.

The product of its digits is 1524096, while the sum is 55.

The square root of 86787919 is about 9316.0033812789. The cubic root of 86787919 is about 442.7444151760.

The spelling of 86787919 in words is "eighty-six million, seven hundred eighty-seven thousand, nine hundred nineteen".