78888868 has 6 divisors (see below), whose sum is σ = 138055526. Its totient is φ = 39444432.

The previous prime is 78888863. The next prime is 78888871. The reversal of 78888868 is 86888887.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 59721984 + 19166884 = 7728^2 + 4378^2 .

It is not an unprimeable number, because it can be changed into a prime (78888863) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9861105 + ... + 9861112.

Almost surely, 2^78888868 is an apocalyptic number.

It is an amenable number.

78888868 is a deficient number, since it is larger than the sum of its proper divisors (59166658).

78888868 is a wasteful number, since it uses less digits than its factorization.

78888868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19722221 (or 19722219 counting only the distinct ones).

The product of its digits is 11010048, while the sum is 61.

The square root of 78888868 is about 8881.9405537304. The cubic root of 78888868 is about 428.8827458868.

The spelling of 78888868 in words is "seventy-eight million, eight hundred eighty-eight thousand, eight hundred sixty-eight".