82178380 has 12 divisors (see below), whose sum is σ = 172574640. Its totient is φ = 32871344.

The previous prime is 82178359. The next prime is 82178413. The reversal of 82178380 is 8387128.

It is a super-2 number, since 2×82178380² = 13506572278848800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2054440 + ... + 2054479.

It is an arithmetic number, because the mean of its divisors is an integer number (14381220).

Almost surely, 2^82178380 is an apocalyptic number.

It is an amenable number.

82178380 is an abundant number, since it is smaller than the sum of its proper divisors (90396260).

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

82178380 is a wasteful number, since it uses less digits than its factorization.

82178380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108928 (or 4108926 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 37.

The square root of 82178380 is about 9065.2291752608. The cubic root of 82178380 is about 434.7629483081.

The spelling of 82178380 in words is "eighty-two million, one hundred seventy-eight thousand, three hundred eighty".