68928140 has 24 divisors (see below), whose sum is σ = 148117200. Its totient is φ = 26929728.

The previous prime is 68928131. The next prime is 68928187. The reversal of 68928140 is 4182986.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 68928094 and 68928103.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 39215 + ... + 40934.

It is an arithmetic number, because the mean of its divisors is an integer number (6171550).

Almost surely, 2^68928140 is an apocalyptic number.

It is an amenable number.

68928140 is an abundant number, since it is smaller than the sum of its proper divisors (79189060).

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

68928140 is a wasteful number, since it uses less digits than its factorization.

68928140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80201 (or 80199 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 68928140 is about 8302.2972724421. The cubic root of 68928140 is about 410.0141577503.

The spelling of 68928140 in words is "sixty-eight million, nine hundred twenty-eight thousand, one hundred forty".