78879128 has 32 divisors (see below), whose sum is σ = 154796160. Its totient is φ = 37635840.

The previous prime is 78879107. The next prime is 78879149. The reversal of 78879128 is 82197887.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (78879107) and next prime (78879149).

It is a congruent number.

It is an unprimeable number.

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, 15926 + ... + 20282.

It is an arithmetic number, because the mean of its divisors is an integer number (4837380).

Almost surely, 2^78879128 is an apocalyptic number.

It is an amenable number.

78879128 is a deficient number, since it is larger than the sum of its proper divisors (75917032).

78879128 is a wasteful number, since it uses less digits than its factorization.

78879128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4467 (or 4463 counting only the distinct ones).

The product of its digits is 451584, while the sum is 50.

The square root of 78879128 is about 8881.3922332031. The cubic root of 78879128 is about 428.8650945165.

The spelling of 78879128 in words is "seventy-eight million, eight hundred seventy-nine thousand, one hundred twenty-eight".