78422281 has 16 divisors (see below), whose sum is σ = 92827648. Its totient is φ = 64832400.

The previous prime is 78422237. The next prime is 78422287. The reversal of 78422281 is 18222487.

It is a cyclic number.

It is not a de Polignac number, because 78422281 - 2⁹ = 78421769 is a prime.

It is a super-2 number, since 2×78422281² = 12300108314485922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78422287) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 113146 + ... + 113836.

It is an arithmetic number, because the mean of its divisors is an integer number (5801728).

Almost surely, 2^78422281 is an apocalyptic number.

It is an amenable number.

78422281 is a deficient number, since it is larger than the sum of its proper divisors (14405367).

78422281 is a wasteful number, since it uses less digits than its factorization.

78422281 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1252.

The product of its digits is 14336, while the sum is 34.

The square root of 78422281 is about 8855.6355503148. The cubic root of 78422281 is about 428.0355332685.

The spelling of 78422281 in words is "seventy-eight million, four hundred twenty-two thousand, two hundred eighty-one".