78281113 has 6 divisors (see below), whose sum is σ = 80145834. Its totient is φ = 76458816.

The previous prime is 78281111. The next prime is 78281123. The reversal of 78281113 is 31118287.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 74701449 + 3579664 = 8643^2 + 1892^2 .

It is not a de Polignac number, because 78281113 - 2¹ = 78281111 is a prime.

It is a super-2 number, since 2×78281113² = 12255865305037538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78281111) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19320 + ... + 23017.

It is an arithmetic number, because the mean of its divisors is an integer number (13357639).

Almost surely, 2^78281113 is an apocalyptic number.

It is an amenable number.

78281113 is a deficient number, since it is larger than the sum of its proper divisors (1864721).

78281113 is an equidigital number, since it uses as much as digits as its factorization.

78281113 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42423 (or 42380 counting only the distinct ones).

The product of its digits is 2688, while the sum is 31.

The square root of 78281113 is about 8847.6614424378. The cubic root of 78281113 is about 427.7785433218.

The spelling of 78281113 in words is "seventy-eight million, two hundred eighty-one thousand, one hundred thirteen".