78280860 has 96 divisors (see below), whose sum is σ = 259176960. Its totient is φ = 17273088.

The previous prime is 78280847. The next prime is 78280861. The reversal of 78280860 is 6808287.

It is a super-2 number, since 2×78280860² = 12255786084679200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78280861) by changing a digit.

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 31 ways as a sum of consecutive naturals, for example, 8967 + ... + 15393.

It is an arithmetic number, because the mean of its divisors is an integer number (2699760).

Almost surely, 2^78280860 is an apocalyptic number.

78280860 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78280860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (129588480).

78280860 is an abundant number, since it is smaller than the sum of its proper divisors (180896100).

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

78280860 is a wasteful number, since it uses less digits than its factorization.

78280860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6475 (or 6473 counting only the distinct ones).

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

The square root of 78280860 is about 8847.6471448629. The cubic root of 78280860 is about 427.7780824695.

The spelling of 78280860 in words is "seventy-eight million, two hundred eighty thousand, eight hundred sixty".