68999994 has 24 divisors (see below), whose sum is σ = 170857440.
Its totient is φ = 19714248.
The previous prime is 68999981. The next prime is 69000047. The reversal of 68999994 is 49999986.
It is a Harshad number since it is a multiple of its sum of digits (63).
It is an unprimeable number.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 273684 + ... + 273935.
It is an arithmetic number, because the mean of its divisors is an integer number (7119060).
Almost surely, 268999994 is an apocalyptic number.
68999994 is an abundant number, since it is smaller than the sum of its proper divisors (101857446).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
68999994 is a wasteful number, since it uses less digits than its factorization.
68999994 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 547634 (or 547631 counting only the distinct ones).
The product of its digits is 11337408, while the sum is 63.
The square root of 68999994 is about 8306.6235017605.
The cubic root of 68999994 is about 410.1565810816.
It can be divided in two parts, 6 and 8999994, that added together give a square (9000000 = 30002).
The spelling of 68999994 in words is "sixty-eight million, nine hundred ninety-nine thousand, nine hundred ninety-four".