140639028 has 48 divisors (see below), whose sum is σ = 348445440. Its totient is φ = 43997184.

The previous prime is 140639017. The next prime is 140639041. The reversal of 140639028 is 820936041.

140639028 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 140639028.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93708 + ... + 95196.

It is an arithmetic number, because the mean of its divisors is an integer number (7259280).

Almost surely, 2^140639028 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 140639028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (174222720).

140639028 is an abundant number, since it is smaller than the sum of its proper divisors (207806412).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

140639028 is a wasteful number, since it uses less digits than its factorization.

140639028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1976 (or 1974 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 140639028 is about 11859.1326832952. The cubic root of 140639028 is about 520.0382466937.

The spelling of 140639028 in words is "one hundred forty million, six hundred thirty-nine thousand, twenty-eight".