68991384 has 128 divisors (see below), whose sum is σ = 221068800. Its totient is φ = 17418240.

The previous prime is 68991361. The next prime is 68991407. The reversal of 68991384 is 48319986.

It is an interprime number because it is at equal distance from previous prime (68991361) and next prime (68991407).

It is a super-3 number, since 3×68991384³ (a number of 24 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67872 + ... + 68880.

It is an arithmetic number, because the mean of its divisors is an integer number (1727100).

Almost surely, 2^68991384 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 68991384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110534400).

68991384 is an abundant number, since it is smaller than the sum of its proper divisors (152077416).

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

68991384 is a wasteful number, since it uses less digits than its factorization.

68991384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073 (or 1069 counting only the distinct ones).

The product of its digits is 373248, while the sum is 48.

The square root of 68991384 is about 8306.1052244719. The cubic root of 68991384 is about 410.1395202344.

The spelling of 68991384 in words is "sixty-eight million, nine hundred ninety-one thousand, three hundred eighty-four".