78286516 has 54 divisors (see below), whose sum is σ = 175227234. Its totient is φ = 30492000.

The previous prime is 78286511. The next prime is 78286519. The reversal of 78286516 is 61568287.

It can be written as a sum of positive squares in only one way, i.e., 56942116 + 21344400 = 7546^2 + 4620^2 .

It is a super-2 number, since 2×78286516² = 12257557174836512, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78286511) 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 17 ways as a sum of consecutive naturals, for example, 22066 + ... + 25366.

Almost surely, 2^78286516 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 78286516, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (87613617).

78286516 is an abundant number, since it is smaller than the sum of its proper divisors (96940718).

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

78286516 is a wasteful number, since it uses less digits than its factorization.

78286516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3341 (or 3321 counting only the distinct ones).

The product of its digits is 161280, while the sum is 43.

The square root of 78286516 is about 8847.9667720895. The cubic root of 78286516 is about 427.7883849222.

The spelling of 78286516 in words is "seventy-eight million, two hundred eighty-six thousand, five hundred sixteen".