82291640 has 16 divisors (see below), whose sum is σ = 185156280. Its totient is φ = 32916640.

The previous prime is 82291613. The next prime is 82291661. The reversal of 82291640 is 4619228.

It is a junction number, because it is equal to n+sod(n) for n = 82291597 and 82291606.

It is a congruent number.

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, 1028606 + ... + 1028685.

Almost surely, 2^82291640 is an apocalyptic number.

It is an amenable number.

82291640 is an abundant number, since it is smaller than the sum of its proper divisors (102864640).

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

82291640 is a wasteful number, since it uses less digits than its factorization.

82291640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2057302 (or 2057298 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 32.

The square root of 82291640 is about 9071.4739706401. The cubic root of 82291640 is about 434.9625898158.

The spelling of 82291640 in words is "eighty-two million, two hundred ninety-one thousand, six hundred forty".