82691784 has 48 divisors (see below), whose sum is σ = 255952320. Its totient is φ = 23626080.

The previous prime is 82691779. The next prime is 82691801. The reversal of 82691784 is 48719628.

It is a super-2 number, since 2×82691784² = 13675862282205312, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 81532 + ... + 82539.

It is an arithmetic number, because the mean of its divisors is an integer number (5332340).

Almost surely, 2^82691784 is an apocalyptic number.

82691784 is a gapful number since it is divisible by the number (84) formed by its first and last digit.

It is an amenable number.

82691784 is an abundant number, since it is smaller than the sum of its proper divisors (173260536).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

82691784 is a wasteful number, since it uses less digits than its factorization.

82691784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164090 (or 164083 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 82691784 is about 9093.5022955955. The cubic root of 82691784 is about 435.6664536479. Note that the first 3 decimals are identical.

The spelling of 82691784 in words is "eighty-two million, six hundred ninety-one thousand, seven hundred eighty-four".