77113821 has 16 divisors (see below), whose sum is σ = 104943680. Its totient is φ = 50353920.

The previous prime is 77113811. The next prime is 77113823. The reversal of 77113821 is 12831177.

It is not a de Polignac number, because 77113821 - 2⁵ = 77113789 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 (77113823) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51045 + ... + 52533.

It is an arithmetic number, because the mean of its divisors is an integer number (6558980).

Almost surely, 2^77113821 is an apocalyptic number.

It is an amenable number.

77113821 is a deficient number, since it is larger than the sum of its proper divisors (27829859).

77113821 is a wasteful number, since it uses less digits than its factorization.

77113821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1836.

The product of its digits is 2352, while the sum is 30.

The square root of 77113821 is about 8781.4475458207. The cubic root of 77113821 is about 425.6416071414.

Adding to 77113821 its reverse (12831177), we get a palindrome (89944998).

The spelling of 77113821 in words is "seventy-seven million, one hundred thirteen thousand, eight hundred twenty-one".