82978563 has 4 divisors (see below), whose sum is σ = 110638088. Its totient is φ = 55319040.

The previous prime is 82978559. The next prime is 82978601. The reversal of 82978563 is 36587928.

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

It is not a de Polignac number, because 82978563 - 2² = 82978559 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82978163) 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, 13829758 + ... + 13829763.

It is an arithmetic number, because the mean of its divisors is an integer number (27659522).

Almost surely, 2^82978563 is an apocalyptic number.

82978563 is a deficient number, since it is larger than the sum of its proper divisors (27659525).

82978563 is a wasteful number, since it uses less digits than its factorization.

82978563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27659524.

The product of its digits is 725760, while the sum is 48.

The square root of 82978563 is about 9109.2569949475. The cubic root of 82978563 is about 436.1695098119.

The spelling of 82978563 in words is "eighty-two million, nine hundred seventy-eight thousand, five hundred sixty-three".