142640644 has 12 divisors (see below), whose sum is σ = 249760000. Its totient is φ = 71280648.

The previous prime is 142640627. The next prime is 142640653. The reversal of 142640644 is 446046241.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 924 + ... + 16915.

Almost surely, 2^142640644 is an apocalyptic number.

It is an amenable number.

142640644 is a deficient number, since it is larger than the sum of its proper divisors (107119356).

142640644 is a wasteful number, since it uses less digits than its factorization.

142640644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19842 (or 19840 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 31.

The square root of 142640644 is about 11943.2258623874. The cubic root of 142640644 is about 522.4937465579.

Adding to 142640644 its reverse (446046241), we get a palindrome (588686885).

The spelling of 142640644 in words is "one hundred forty-two million, six hundred forty thousand, six hundred forty-four".