82991445 has 8 divisors (see below), whose sum is σ = 132786336. Its totient is φ = 44262096.

The previous prime is 82991443. The next prime is 82991453. The reversal of 82991445 is 54419928.

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

It is not a de Polignac number, because 82991445 - 2¹ = 82991443 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 82991397 and 82991406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82991443) 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, 2766367 + ... + 2766396.

It is an arithmetic number, because the mean of its divisors is an integer number (16598292).

Almost surely, 2^82991445 is an apocalyptic number.

It is an amenable number.

82991445 is a deficient number, since it is larger than the sum of its proper divisors (49794891).

82991445 is a wasteful number, since it uses less digits than its factorization.

82991445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5532771.

The product of its digits is 103680, while the sum is 42.

The square root of 82991445 is about 9109.9640504230. The cubic root of 82991445 is about 436.1920796769.

It can be divided in two parts, 82991 and 445, that added together give a triangular number (83436 = T₄₀₈).

The spelling of 82991445 in words is "eighty-two million, nine hundred ninety-one thousand, four hundred forty-five".