83891655 has 12 divisors (see below), whose sum is σ = 145412280. Its totient is φ = 44742192.

The previous prime is 83891641. The next prime is 83891659. The reversal of 83891655 is 55619838.

It is not a de Polignac number, because 83891655 - 2⁵ = 83891623 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 1864259 = 83891655 / (8 + 3 + 8 + 9 + 1 + 6 + 5 + 5).

It is a self number, because there is not a number n which added to its sum of digits gives 83891655.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (83891659) 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, 932085 + ... + 932174.

It is an arithmetic number, because the mean of its divisors is an integer number (12117690).

Almost surely, 2^83891655 is an apocalyptic number.

83891655 is a deficient number, since it is larger than the sum of its proper divisors (61520625).

83891655 is a wasteful number, since it uses less digits than its factorization.

83891655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1864270 (or 1864267 counting only the distinct ones).

The product of its digits is 259200, while the sum is 45.

The square root of 83891655 is about 9159.2387784138. The cubic root of 83891655 is about 437.7635397214.

The spelling of 83891655 in words is "eighty-three million, eight hundred ninety-one thousand, six hundred fifty-five".