142006644 has 108 divisors (see below), whose sum is σ = 411861996. Its totient is φ = 41094144.

The previous prime is 142006633. The next prime is 142006679. The reversal of 142006644 is 446600241.

142006644 is a `hidden beast` number, since 14 + 2 + 0 + 0 + 6 + 644 = 666.

It can be written as a sum of positive squares in 6 ways, for example, as 1299600 + 140707044 = 1140^2 + 11862^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 102742 + ... + 104114.

It is an arithmetic number, because the mean of its divisors is an integer number (3813537).

Almost surely, 2^142006644 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 142006644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (205930998).

142006644 is an abundant number, since it is smaller than the sum of its proper divisors (269855352).

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

142006644 is a wasteful number, since it uses less digits than its factorization.

142006644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426 (or 1408 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 142006644 is about 11916.6540605994. The cubic root of 142006644 is about 521.7184812226.

Adding to 142006644 its reverse (446600241), we get a palindrome (588606885).

The spelling of 142006644 in words is "one hundred forty-two million, six thousand, six hundred forty-four".