82197945 has 48 divisors (see below), whose sum is σ = 146390400. Its totient is φ = 42653952.

The previous prime is 82197943. The next prime is 82197949. The reversal of 82197945 is 54979128.

It is not a de Polignac number, because 82197945 - 2¹ = 82197943 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 82197945.

It is not an unprimeable number, because it can be changed into a prime (82197943) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 412956 + ... + 413154.

It is an arithmetic number, because the mean of its divisors is an integer number (3049800).

Almost surely, 2^82197945 is an apocalyptic number.

It is an amenable number.

82197945 is a deficient number, since it is larger than the sum of its proper divisors (64192455).

82197945 is a wasteful number, since it uses less digits than its factorization.

82197945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 414 (or 411 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 82197945 is about 9066.3082343366. The cubic root of 82197945 is about 434.7974483073.

The spelling of 82197945 in words is "eighty-two million, one hundred ninety-seven thousand, nine hundred forty-five".