78349281 has 16 divisors (see below), whose sum is σ = 107153280. Its totient is φ = 50906240.

The previous prime is 78349273. The next prime is 78349303. The reversal of 78349281 is 18294387.

It is a cyclic number.

It is not a de Polignac number, because 78349281 - 2³ = 78349273 is a prime.

It is a super-2 number, since 2×78349281² = 12277219666433922, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (78349781) 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 15 ways as a sum of consecutive naturals, for example, 16891 + ... + 21023.

It is an arithmetic number, because the mean of its divisors is an integer number (6697080).

Almost surely, 2^78349281 is an apocalyptic number.

78349281 is a gapful number since it is divisible by the number (71) formed by its first and last digit.

It is an amenable number.

78349281 is a deficient number, since it is larger than the sum of its proper divisors (28803999).

78349281 is a wasteful number, since it uses less digits than its factorization.

78349281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4296.

The product of its digits is 96768, while the sum is 42.

The square root of 78349281 is about 8851.5129215293. The cubic root of 78349281 is about 427.9026786175.

The spelling of 78349281 in words is "seventy-eight million, three hundred forty-nine thousand, two hundred eighty-one".