78437280 has 48 divisors (see below), whose sum is σ = 247078944. Its totient is φ = 20916480.

The previous prime is 78437279. The next prime is 78437329. The reversal of 78437280 is 8273487.

It is a tau number, because it is divible by the number of its divisors (48).

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, 81226 + ... + 82185.

It is an arithmetic number, because the mean of its divisors is an integer number (5147478).

Almost surely, 2^78437280 is an apocalyptic number.

It is an amenable number.

78437280 is an abundant number, since it is smaller than the sum of its proper divisors (168641664).

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

78437280 is a wasteful number, since it uses less digits than its factorization.

78437280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 163429 (or 163421 counting only the distinct ones).

The product of its (nonzero) digits is 75264, while the sum is 39.

The square root of 78437280 is about 8856.4823716869. The cubic root of 78437280 is about 428.0628201382.

The spelling of 78437280 in words is "seventy-eight million, four hundred thirty-seven thousand, two hundred eighty".