83807865 has 20 divisors (see below), whose sum is σ = 150234084. Its totient is φ = 44697312.

The previous prime is 83807831. The next prime is 83807873. The reversal of 83807865 is 56870838.

It can be written as a sum of positive squares in 2 ways, for example, as 21650409 + 62157456 = 4653^2 + 7884^2 .

It is not a de Polignac number, because 83807865 - 2¹¹ = 83805817 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 83807865.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 103062 + ... + 103871.

Almost surely, 2^83807865 is an apocalyptic number.

It is an amenable number.

83807865 is a deficient number, since it is larger than the sum of its proper divisors (66426219).

83807865 is a wasteful number, since it uses less digits than its factorization.

83807865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 206950 (or 206941 counting only the distinct ones).

The product of its (nonzero) digits is 322560, while the sum is 45.

The square root of 83807865 is about 9154.6635656369. The cubic root of 83807865 is about 437.6177468107.

The spelling of 83807865 in words is "eighty-three million, eight hundred seven thousand, eight hundred sixty-five".