82778299 has 4 divisors (see below), whose sum is σ = 84013864. Its totient is φ = 81542736.

The previous prime is 82778273. The next prime is 82778309. The reversal of 82778299 is 99287728.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 82778299 - 2⁹ = 82777787 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (82778249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 617682 + ... + 617815.

It is an arithmetic number, because the mean of its divisors is an integer number (21003466).

Almost surely, 2^82778299 is an apocalyptic number.

82778299 is a deficient number, since it is larger than the sum of its proper divisors (1235565).

82778299 is a wasteful number, since it uses less digits than its factorization.

82778299 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235564.

The product of its digits is 1016064, while the sum is 52.

The square root of 82778299 is about 9098.2580200827. The cubic root of 82778299 is about 435.8183371212.

The spelling of 82778299 in words is "eighty-two million, seven hundred seventy-eight thousand, two hundred ninety-nine".