140642644 has 6 divisors (see below), whose sum is σ = 246124634. Its totient is φ = 70321320.

The previous prime is 140642639. The next prime is 140642647. The reversal of 140642644 is 446246041.

It can be written as a sum of positive squares in only one way, i.e., 129686544 + 10956100 = 11388^2 + 3310^2 .

It is a super-2 number, since 2×140642644² = 39560706622621472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140642647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17580327 + ... + 17580334.

Almost surely, 2^140642644 is an apocalyptic number.

It is an amenable number.

140642644 is a deficient number, since it is larger than the sum of its proper divisors (105481990).

140642644 is a wasteful number, since it uses less digits than its factorization.

140642644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35160665 (or 35160663 counting only the distinct ones).

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

The square root of 140642644 is about 11859.2851386582. The cubic root of 140642644 is about 520.0427035936.

Adding to 140642644 its reverse (446246041), we get a palindrome (586888685).

The spelling of 140642644 in words is "one hundred forty million, six hundred forty-two thousand, six hundred forty-four".