82781656 has 32 divisors (see below), whose sum is σ = 160778880. Its totient is φ = 39916800.

The previous prime is 82781639. The next prime is 82781663. The reversal of 82781656 is 65618728.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133860 + ... + 134476.

It is an arithmetic number, because the mean of its divisors is an integer number (5024340).

Almost surely, 2^82781656 is an apocalyptic number.

It is an amenable number.

82781656 is a deficient number, since it is larger than the sum of its proper divisors (77997224).

82781656 is a wasteful number, since it uses less digits than its factorization.

82781656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1195 (or 1191 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 82781656 is about 9098.4425040773. The cubic root of 82781656 is about 435.8242284494.

The spelling of 82781656 in words is "eighty-two million, seven hundred eighty-one thousand, six hundred fifty-six".