77884973 has 4 divisors (see below), whose sum is σ = 82466460. Its totient is φ = 73303488.

The previous prime is 77884951. The next prime is 77884991. The reversal of 77884973 is 37948877.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37948877 = 257 ⋅147661.

It can be written as a sum of positive squares in 2 ways, for example, as 49603849 + 28281124 = 7043^2 + 5318^2 .

It is a cyclic number.

It is not a de Polignac number, because 77884973 - 2²⁶ = 10776109 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 (77884913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2290718 + ... + 2290751.

It is an arithmetic number, because the mean of its divisors is an integer number (20616615).

Almost surely, 2^77884973 is an apocalyptic number.

It is an amenable number.

77884973 is a deficient number, since it is larger than the sum of its proper divisors (4581487).

77884973 is a wasteful number, since it uses less digits than its factorization.

77884973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4581486.

The product of its digits is 2370816, while the sum is 53.

The square root of 77884973 is about 8825.2463421709. The cubic root of 77884973 is about 427.0557344519.

The spelling of 77884973 in words is "seventy-seven million, eight hundred eighty-four thousand, nine hundred seventy-three".