142320644 has 12 divisors (see below), whose sum is σ = 249602304. Its totient is φ = 71005704.

The previous prime is 142320643. The next prime is 142320649. The reversal of 142320644 is 446023241.

It is not an unprimeable number, because it can be changed into a prime (142320643) 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 3 ways as a sum of consecutive naturals, for example, 36572 + ... + 40275.

It is an arithmetic number, because the mean of its divisors is an integer number (20800192).

Almost surely, 2^142320644 is an apocalyptic number.

It is an amenable number.

142320644 is a deficient number, since it is larger than the sum of its proper divisors (107281660).

142320644 is a wasteful number, since it uses less digits than its factorization.

142320644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77314 (or 77312 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 142320644 is about 11929.8216248190. The cubic root of 142320644 is about 522.1027332139.

Adding to 142320644 its reverse (446023241), we get a palindrome (588343885).

The spelling of 142320644 in words is "one hundred forty-two million, three hundred twenty thousand, six hundred forty-four".