78440880 has 80 divisors (see below), whose sum is σ = 277910784. Its totient is φ = 17928960.

The previous prime is 78440867. The next prime is 78440903. The reversal of 78440880 is 8804487.

It is a tau number, because it is divible by the number of its divisors (80).

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 15 ways as a sum of consecutive naturals, for example, 21666 + ... + 25025.

Almost surely, 2^78440880 is an apocalyptic number.

78440880 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

78440880 is an abundant number, since it is smaller than the sum of its proper divisors (199469904).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78440880 is a wasteful number, since it uses less digits than its factorization.

78440880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46714 (or 46708 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 39.

The square root of 78440880 is about 8856.6856103172. The cubic root of 78440880 is about 428.0693689059.

The spelling of 78440880 in words is "seventy-eight million, four hundred forty thousand, eight hundred eighty".