82978555 has 16 divisors (see below), whose sum is σ = 108824544. Its totient is φ = 60238080.

The previous prime is 82978517. The next prime is 82978559. The reversal of 82978555 is 55587928.

It is a de Polignac number, because none of the positive numbers 2^k-82978555 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 82978499 and 82978508.

It is not an unprimeable number, because it can be changed into a prime (82978559) 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, 40639 + ... + 42631.

It is an arithmetic number, because the mean of its divisors is an integer number (6801534).

Almost surely, 2^82978555 is an apocalyptic number.

82978555 is a deficient number, since it is larger than the sum of its proper divisors (25845989).

82978555 is a wasteful number, since it uses less digits than its factorization.

82978555 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2766.

The product of its digits is 1008000, while the sum is 49.

The square root of 82978555 is about 9109.2565558337. The cubic root of 82978555 is about 436.1694957948.

The spelling of 82978555 in words is "eighty-two million, nine hundred seventy-eight thousand, five hundred fifty-five".