78787898 has 16 divisors (see below), whose sum is σ = 135268224. Its totient is φ = 33715440.

The previous prime is 78787897. The next prime is 78787901. The reversal of 78787898 is 89878787.

78787898 is an esthetic number in base 10, because in such base its adjacent digits differ by 1.

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 78787898.

It is not an unprimeable number, because it can be changed into a prime (78787897) 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 7 ways as a sum of consecutive naturals, for example, 6308 + ... + 14048.

It is an arithmetic number, because the mean of its divisors is an integer number (8454264).

Almost surely, 2^78787898 is an apocalyptic number.

78787898 is a deficient number, since it is larger than the sum of its proper divisors (56480326).

78787898 is a wasteful number, since it uses less digits than its factorization.

78787898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8477.

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

The square root of 78787898 is about 8876.2547282060. The cubic root of 78787898 is about 428.6996918422.

The spelling of 78787898 in words is "seventy-eight million, seven hundred eighty-seven thousand, eight hundred ninety-eight".