44671681 has 16 divisors (see below), whose sum is σ = 47779200. Its totient is φ = 41678208.

The previous prime is 44671663. The next prime is 44671723. The reversal of 44671681 is 18617644.

It is a happy number.

It is not a de Polignac number, because 44671681 - 2⁷ = 44671553 is a prime.

It is a super-2 number, since 2×44671681² = 3991118166731522, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 44671681.

It is not an unprimeable number, because it can be changed into a prime (44671661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 284455 + ... + 284611.

It is an arithmetic number, because the mean of its divisors is an integer number (2986200).

Almost surely, 2^44671681 is an apocalyptic number.

It is an amenable number.

44671681 is a deficient number, since it is larger than the sum of its proper divisors (3107519).

44671681 is a wasteful number, since it uses less digits than its factorization.

44671681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408.

The product of its digits is 32256, while the sum is 37.

The square root of 44671681 is about 6683.6876797169. The cubic root of 44671681 is about 354.8221843074.

It can be divided in two parts, 446 and 71681, that added together give a palindrome (72127).

The spelling of 44671681 in words is "forty-four million, six hundred seventy-one thousand, six hundred eighty-one".