78897788 has 12 divisors (see below), whose sum is σ = 139623120. Its totient is φ = 39005472.

The previous prime is 78897787. The next prime is 78897803. The reversal of 78897788 is 88779887.

It is a self number, because there is not a number n which added to its sum of digits gives 78897788.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78897787) 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, 110456 + ... + 111167.

It is an arithmetic number, because the mean of its divisors is an integer number (11635260).

Almost surely, 2^78897788 is an apocalyptic number.

It is an amenable number.

78897788 is a deficient number, since it is larger than the sum of its proper divisors (60725332).

78897788 is a wasteful number, since it uses less digits than its factorization.

78897788 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 221716 (or 221714 counting only the distinct ones).

The product of its digits is 12644352, while the sum is 62.

The square root of 78897788 is about 8882.4426820554. The cubic root of 78897788 is about 428.8989099330.

The spelling of 78897788 in words is "seventy-eight million, eight hundred ninety-seven thousand, seven hundred eighty-eight".