82191740 has 24 divisors (see below), whose sum is σ = 172921392. Its totient is φ = 32816000.

The previous prime is 82191737. The next prime is 82191743. The reversal of 82191740 is 4719128.

It is an interprime number because it is at equal distance from previous prime (82191737) and next prime (82191743).

It is a junction number, because it is equal to n+sod(n) for n = 82191697 and 82191706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82191743) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8240 + ... + 15240.

It is an arithmetic number, because the mean of its divisors is an integer number (7205058).

Almost surely, 2^82191740 is an apocalyptic number.

It is an amenable number.

82191740 is an abundant number, since it is smaller than the sum of its proper divisors (90729652).

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

82191740 is a wasteful number, since it uses less digits than its factorization.

82191740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7597 (or 7595 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 82191740 is about 9065.9660268501. The cubic root of 82191740 is about 434.7865072955.

The spelling of 82191740 in words is "eighty-two million, one hundred ninety-one thousand, seven hundred forty".