68923440 has 160 divisors (see below), whose sum is σ = 251501760. Its totient is φ = 17289216.

The previous prime is 68923429. The next prime is 68923441. The reversal of 68923440 is 4432986.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68923395 and 68923404.

It is not an unprimeable number, because it can be changed into a prime (68923441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 35782 + ... + 37658.

It is an arithmetic number, because the mean of its divisors is an integer number (1571886).

Almost surely, 2^68923440 is an apocalyptic number.

68923440 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 68923440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125750880).

68923440 is an abundant number, since it is smaller than the sum of its proper divisors (182578320).

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

68923440 is a wasteful number, since it uses less digits than its factorization.

68923440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1916 (or 1904 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 68923440 is about 8302.0142134304. The cubic root of 68923440 is about 410.0048383328.

The spelling of 68923440 in words is "sixty-eight million, nine hundred twenty-three thousand, four hundred forty".