78787876 has 6 divisors (see below), whose sum is σ = 137878790. Its totient is φ = 39393936.

The previous prime is 78787861. The next prime is 78787883. The reversal of 78787876 is 67878787.

78787876 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

It can be written as a sum of positive squares in only one way, i.e., 78747876 + 40000 = 8874^2 + 200^2 .

It is an alternating number because its digits alternate between odd and even.

It is a self number, because there is not a number n which added to its sum of digits gives 78787876.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9848481 + ... + 9848488.

Almost surely, 2^78787876 is an apocalyptic number.

It is an amenable number.

78787876 is a deficient number, since it is larger than the sum of its proper divisors (59090914).

78787876 is a wasteful number, since it uses less digits than its factorization.

78787876 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19696973 (or 19696971 counting only the distinct ones).

The product of its digits is 7375872, while the sum is 58.

The square root of 78787876 is about 8876.2534889445. The cubic root of 78787876 is about 428.6996519402.

The spelling of 78787876 in words is "seventy-eight million, seven hundred eighty-seven thousand, eight hundred seventy-six".