78431880 has 64 divisors (see below), whose sum is σ = 249143040. Its totient is φ = 19684352.

The previous prime is 78431869. The next prime is 78431887. The reversal of 78431880 is 8813487.

It is not an unprimeable number, because it can be changed into a prime (78431887) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 17184 + ... + 21263.

It is an arithmetic number, because the mean of its divisors is an integer number (3892860).

Almost surely, 2^78431880 is an apocalyptic number.

It is an amenable number.

78431880 is an abundant number, since it is smaller than the sum of its proper divisors (170711160).

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

78431880 is a wasteful number, since it uses less digits than its factorization.

78431880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38478 (or 38474 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 39.

The square root of 78431880 is about 8856.1775049962. The cubic root of 78431880 is about 428.0529966110.

The spelling of 78431880 in words is "seventy-eight million, four hundred thirty-one thousand, eight hundred eighty".