82991945 has 8 divisors (see below), whose sum is σ = 99946440. Its totient is φ = 66156160.

The previous prime is 82991933. The next prime is 82991969. The reversal of 82991945 is 54919928.

It can be written as a sum of positive squares in 4 ways, for example, as 22401289 + 60590656 = 4733^2 + 7784^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-82991945 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 82991945.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28130 + ... + 30939.

It is an arithmetic number, because the mean of its divisors is an integer number (12493305).

Almost surely, 2^82991945 is an apocalyptic number.

It is an amenable number.

82991945 is a deficient number, since it is larger than the sum of its proper divisors (16954495).

82991945 is a wasteful number, since it uses less digits than its factorization.

82991945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 59355.

The product of its digits is 233280, while the sum is 47.

The square root of 82991945 is about 9109.9914928610. The cubic root of 82991945 is about 436.1929556531.

The spelling of 82991945 in words is "eighty-two million, nine hundred ninety-one thousand, nine hundred forty-five".