78416281 has 4 divisors (see below), whose sum is σ = 78488100. Its totient is φ = 78344464.

The previous prime is 78416243. The next prime is 78416311. The reversal of 78416281 is 18261487.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 18261487 = 151 ⋅120937.

It can be written as a sum of positive squares in 2 ways, for example, as 37711881 + 40704400 = 6141^2 + 6380^2 .

It is a cyclic number.

It is not a de Polignac number, because 78416281 - 2¹¹ = 78414233 is a prime.

It is a super-2 number, since 2×78416281² = 12298226251741922, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78416281.

It is not an unprimeable number, because it can be changed into a prime (78416201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34246 + ... + 36463.

It is an arithmetic number, because the mean of its divisors is an integer number (19622025).

Almost surely, 2^78416281 is an apocalyptic number.

It is an amenable number.

78416281 is a deficient number, since it is larger than the sum of its proper divisors (71819).

78416281 is a wasteful number, since it uses less digits than its factorization.

78416281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71818.

The product of its digits is 21504, while the sum is 37.

The square root of 78416281 is about 8855.2967765061. The cubic root of 78416281 is about 428.0246168186.

The spelling of 78416281 in words is "seventy-eight million, four hundred sixteen thousand, two hundred eighty-one".