78531280 has 40 divisors (see below), whose sum is σ = 184800672. Its totient is φ = 31031424.

The previous prime is 78531253. The next prime is 78531289. The reversal of 78531280 is 8213587.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531289) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 727 + ... + 12553.

Almost surely, 2^78531280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78531280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (92400336).

78531280 is an abundant number, since it is smaller than the sum of its proper divisors (106269392).

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

78531280 is a wasteful number, since it uses less digits than its factorization.

78531280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11923 (or 11917 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 78531280 is about 8861.7876300440. The cubic root of 78531280 is about 428.2337500921.

The spelling of 78531280 in words is "seventy-eight million, five hundred thirty-one thousand, two hundred eighty".