44978981 has 6 divisors (see below), whose sum is σ = 45342246. Its totient is φ = 44618600.

The previous prime is 44978963. The next prime is 44978987. The reversal of 44978981 is 18987944.

44978981 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 42902500 + 2076481 = 6550^2 + 1441^2 .

It is not a de Polignac number, because 44978981 - 2²² = 40784677 is a prime.

It is a super-2 number, since 2×44978981² = 4046217463596722, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (44978987) 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 5 ways as a sum of consecutive naturals, for example, 15851 + ... + 18471.

It is an arithmetic number, because the mean of its divisors is an integer number (7557041).

Almost surely, 2^44978981 is an apocalyptic number.

It is an amenable number.

44978981 is a deficient number, since it is larger than the sum of its proper divisors (363265).

44978981 is an equidigital number, since it uses as much as digits as its factorization.

44978981 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2883 (or 2752 counting only the distinct ones).

The product of its digits is 580608, while the sum is 50.

The square root of 44978981 is about 6706.6370857532. The cubic root of 44978981 is about 355.6339423130.

The spelling of 44978981 in words is "forty-four million, nine hundred seventy-eight thousand, nine hundred eighty-one".