86638861 has 4 divisors (see below), whose sum is σ = 90405792. Its totient is φ = 82871932.

The previous prime is 86638859. The next prime is 86638883. The reversal of 86638861 is 16883668.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 86638861 - 2¹ = 86638859 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (86638801) 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, 1883431 + ... + 1883476.

It is an arithmetic number, because the mean of its divisors is an integer number (22601448).

Almost surely, 2^86638861 is an apocalyptic number.

It is an amenable number.

86638861 is a deficient number, since it is larger than the sum of its proper divisors (3766931).

86638861 is a wasteful number, since it uses less digits than its factorization.

86638861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3766930.

The product of its digits is 331776, while the sum is 46.

The square root of 86638861 is about 9307.9998388483. Note that the first 3 decimals coincide. The cubic root of 86638861 is about 442.4907991746.

The spelling of 86638861 in words is "eighty-six million, six hundred thirty-eight thousand, eight hundred sixty-one".