82774813 has 4 divisors (see below), whose sum is σ = 90299808. Its totient is φ = 75249820.

The previous prime is 82774807. The next prime is 82774831. The reversal of 82774813 is 31847728.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 82774813 - 2⁹ = 82774301 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (82774313) 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, 3762481 + ... + 3762502.

It is an arithmetic number, because the mean of its divisors is an integer number (22574952).

Almost surely, 2^82774813 is an apocalyptic number.

It is an amenable number.

82774813 is a deficient number, since it is larger than the sum of its proper divisors (7524995).

82774813 is a wasteful number, since it uses less digits than its factorization.

82774813 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7524994.

The product of its digits is 75264, while the sum is 40.

The square root of 82774813 is about 9098.0664429317. The cubic root of 82774813 is about 435.8122192373.

The spelling of 82774813 in words is "eighty-two million, seven hundred seventy-four thousand, eight hundred thirteen".