68991240 has 64 divisors (see below), whose sum is σ = 210087360. Its totient is φ = 18120960.

The previous prime is 68991239. The next prime is 68991257. The reversal of 68991240 is 4219986.

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, 3750 + ... + 12330.

It is an arithmetic number, because the mean of its divisors is an integer number (3282615).

Almost surely, 2^68991240 is an apocalyptic number.

68991240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68991240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105043680).

68991240 is an abundant number, since it is smaller than the sum of its proper divisors (141096120).

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

68991240 is a wasteful number, since it uses less digits than its factorization.

68991240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8662 (or 8658 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 39.

The square root of 68991240 is about 8306.0965561448. The cubic root of 68991240 is about 410.1392348842.

The spelling of 68991240 in words is "sixty-eight million, nine hundred ninety-one thousand, two hundred forty".