78457880 has 16 divisors (see below), whose sum is σ = 176530320. Its totient is φ = 31383136.

The previous prime is 78457879. The next prime is 78457891. The reversal of 78457880 is 8875487.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 980684 + ... + 980763.

It is an arithmetic number, because the mean of its divisors is an integer number (11033145).

Almost surely, 2^78457880 is an apocalyptic number.

It is an amenable number.

78457880 is an abundant number, since it is smaller than the sum of its proper divisors (98072440).

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

78457880 is a wasteful number, since it uses less digits than its factorization.

78457880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1961458 (or 1961454 counting only the distinct ones).

The product of its (nonzero) digits is 501760, while the sum is 47.

The square root of 78457880 is about 8857.6452852889. The cubic root of 78457880 is about 428.1002909355.

The spelling of 78457880 in words is "seventy-eight million, four hundred fifty-seven thousand, eight hundred eighty".