44278681 has 2 divisors, whose sum is σ = 44278682. Its totient is φ = 44278680.

The previous prime is 44278673. The next prime is 44278687. The reversal of 44278681 is 18687244.

44278681 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41718681 + 2560000 = 6459^2 + 1600^2 .

It is a cyclic number.

It is not a de Polignac number, because 44278681 - 2³ = 44278673 is a prime.

It is a super-2 number, since 2×44278681² = 3921203182199522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (44278687) 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 as a sum of consecutive naturals, namely, 22139340 + 22139341.

It is an arithmetic number, because the mean of its divisors is an integer number (22139341).

Almost surely, 2^44278681 is an apocalyptic number.

44278681 is the 4209-th centered pentagonal number.

It is an amenable number.

44278681 is a deficient number, since it is larger than the sum of its proper divisors (1).

44278681 is an equidigital number, since it uses as much as digits as its factorization.

44278681 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 86016, while the sum is 40.

The square root of 44278681 is about 6654.2227945869. Note that the first 3 decimals coincide. The cubic root of 44278681 is about 353.7785995765.

The spelling of 44278681 in words is "forty-four million, two hundred seventy-eight thousand, six hundred eighty-one".