142740644 has 6 divisors (see below), whose sum is σ = 249796134. Its totient is φ = 71370320.

The previous prime is 142740643. The next prime is 142740649. The reversal of 142740644 is 446047241.

It can be written as a sum of positive squares in only one way, i.e., 141324544 + 1416100 = 11888^2 + 1190^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 142740644.

It is not an unprimeable number, because it can be changed into a prime (142740643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17842577 + ... + 17842584.

It is an arithmetic number, because the mean of its divisors is an integer number (41632689).

Almost surely, 2^142740644 is an apocalyptic number.

It is an amenable number.

142740644 is a deficient number, since it is larger than the sum of its proper divisors (107055490).

142740644 is a wasteful number, since it uses less digits than its factorization.

142740644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35685165 (or 35685163 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 32.

The square root of 142740644 is about 11947.4116025188. The cubic root of 142740644 is about 522.6158182852.

Adding to 142740644 its reverse (446047241), we get a palindrome (588787885).

The spelling of 142740644 in words is "one hundred forty-two million, seven hundred forty thousand, six hundred forty-four".