77882813 has 4 divisors (see below), whose sum is σ = 78217308. Its totient is φ = 77548320.

The previous prime is 77882809. The next prime is 77882837. The reversal of 77882813 is 31828877.

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

It can be written as a sum of positive squares in 2 ways, for example, as 25421764 + 52461049 = 5042^2 + 7243^2 .

It is a cyclic number.

It is not a de Polignac number, because 77882813 - 2² = 77882809 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77882873) 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, 166898 + ... + 167363.

It is an arithmetic number, because the mean of its divisors is an integer number (19554327).

Almost surely, 2^77882813 is an apocalyptic number.

It is an amenable number.

77882813 is a deficient number, since it is larger than the sum of its proper divisors (334495).

77882813 is a wasteful number, since it uses less digits than its factorization.

77882813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334494.

The product of its digits is 150528, while the sum is 44.

The square root of 77882813 is about 8825.1239651350. The cubic root of 77882813 is about 427.0517865405.

It can be divided in two parts, 7788 and 2813, that added together give a palindrome (10601).

The spelling of 77882813 in words is "seventy-seven million, eight hundred eighty-two thousand, eight hundred thirteen".