86642919 has 16 divisors (see below), whose sum is σ = 140029440. Its totient is φ = 52510680.

The previous prime is 86642917. The next prime is 86642921. The reversal of 86642919 is 91924668.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (86642917) and next prime (86642921).

It is not a de Polignac number, because 86642919 - 2¹ = 86642917 is a prime.

It is a super-2 number, since 2×86642919² = 15013990825681122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86642917) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 145567 + ... + 146160.

It is an arithmetic number, because the mean of its divisors is an integer number (8751840).

Almost surely, 2^86642919 is an apocalyptic number.

86642919 is a deficient number, since it is larger than the sum of its proper divisors (53386521).

86642919 is a wasteful number, since it uses less digits than its factorization.

86642919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 291747 (or 291741 counting only the distinct ones).

The product of its digits is 186624, while the sum is 45.

The square root of 86642919 is about 9308.2178208291. The cubic root of 86642919 is about 442.4977075434.

The spelling of 86642919 in words is "eighty-six million, six hundred forty-two thousand, nine hundred nineteen".