83978663 has 4 divisors (see below), whose sum is σ = 84001848. Its totient is φ = 83955480.

The previous prime is 83978611. The next prime is 83978669. The reversal of 83978663 is 36687938.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 83978663 - 2⁶ = 83978599 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 (83978669) 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, 4853 + ... + 13838.

It is an arithmetic number, because the mean of its divisors is an integer number (21000462).

Almost surely, 2^83978663 is an apocalyptic number.

83978663 is a deficient number, since it is larger than the sum of its proper divisors (23185).

83978663 is a wasteful number, since it uses less digits than its factorization.

83978663 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23184.

The product of its digits is 1306368, while the sum is 50.

The square root of 83978663 is about 9163.9872872020. The cubic root of 83978663 is about 437.9148291820.

The spelling of 83978663 in words is "eighty-three million, nine hundred seventy-eight thousand, six hundred sixty-three".