83864865 has 16 divisors (see below), whose sum is σ = 153353088. Its totient is φ = 38338176.

The previous prime is 83864863. The next prime is 83864881. The reversal of 83864865 is 56846838.

It is not a de Polignac number, because 83864865 - 2¹ = 83864863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (83864863) 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, 399252 + ... + 399461.

It is an arithmetic number, because the mean of its divisors is an integer number (9584568).

Almost surely, 2^83864865 is an apocalyptic number.

It is an amenable number.

83864865 is a deficient number, since it is larger than the sum of its proper divisors (69488223).

83864865 is a wasteful number, since it uses less digits than its factorization.

83864865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 798728.

The product of its digits is 1105920, while the sum is 48.

The square root of 83864865 is about 9157.7762038608. The cubic root of 83864865 is about 437.7169362230.

It can be divided in two parts, 838 and 64865, that added together give a triangular number (65703 = T₃₆₂).

The spelling of 83864865 in words is "eighty-three million, eight hundred sixty-four thousand, eight hundred sixty-five".