44142640 has 80 divisors (see below), whose sum is σ = 108475200. Its totient is φ = 16679936.

The previous prime is 44142629. The next prime is 44142649. The reversal of 44142640 is 4624144.

It is a tau number, because it is divible by the number of its divisors (80).

It is not an unprimeable number, because it can be changed into a prime (44142649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 122781 + ... + 123139.

It is an arithmetic number, because the mean of its divisors is an integer number (1355940).

Almost surely, 2^44142640 is an apocalyptic number.

44142640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 44142640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54237600).

44142640 is an abundant number, since it is smaller than the sum of its proper divisors (64332560).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

44142640 is a wasteful number, since it uses less digits than its factorization.

44142640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 448 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 25.

The square root of 44142640 is about 6643.9927754326. The cubic root of 44142640 is about 353.4159136121.

Adding to 44142640 its reverse (4624144), we get a palindrome (48766784).

The spelling of 44142640 in words is "forty-four million, one hundred forty-two thousand, six hundred forty".