44487781 has 4 divisors (see below), whose sum is σ = 47909932. Its totient is φ = 41065632.

The previous prime is 44487763. The next prime is 44487787. The reversal of 44487781 is 18778444.

44487781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14182756 + 30305025 = 3766^2 + 5505^2 .

It is a cyclic number.

It is not a de Polignac number, because 44487781 - 2⁵ = 44487749 is a prime.

It is a super-2 number, since 2×44487781² = 3958325316607922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44487787) 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 3 ways as a sum of consecutive naturals, for example, 1711056 + ... + 1711081.

It is an arithmetic number, because the mean of its divisors is an integer number (11977483).

Almost surely, 2^44487781 is an apocalyptic number.

It is an amenable number.

44487781 is a deficient number, since it is larger than the sum of its proper divisors (3422151).

44487781 is a wasteful number, since it uses less digits than its factorization.

44487781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3422150.

The product of its digits is 200704, while the sum is 43.

The square root of 44487781 is about 6669.9161164141. The cubic root of 44487781 is about 354.3346155664.

The spelling of 44487781 in words is "forty-four million, four hundred eighty-seven thousand, seven hundred eighty-one".