140628639 has 8 divisors (see below), whose sum is σ = 189225520. Its totient is φ = 92892096.

The previous prime is 140628637. The next prime is 140628661. The reversal of 140628639 is 936826041.

140628639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 140628639 - 2¹ = 140628637 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 140628597 and 140628606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (140628637) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 214702 + ... + 215355.

It is an arithmetic number, because the mean of its divisors is an integer number (23653190).

Almost surely, 2^140628639 is an apocalyptic number.

140628639 is a deficient number, since it is larger than the sum of its proper divisors (48596881).

140628639 is a wasteful number, since it uses less digits than its factorization.

140628639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430169.

The product of its (nonzero) digits is 62208, while the sum is 39.

The square root of 140628639 is about 11858.6946583509. The cubic root of 140628639 is about 520.0254413095.

The spelling of 140628639 in words is "one hundred forty million, six hundred twenty-eight thousand, six hundred thirty-nine".