68780040 has 128 divisors (see below), whose sum is σ = 242300160. Its totient is φ = 15289344.

The previous prime is 68780009. The next prime is 68780053. The reversal of 68780040 is 4008786.

It is a junction number, because it is equal to n+sod(n) for n = 68779983 and 68780010.

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, 29974 + ... + 32186.

It is an arithmetic number, because the mean of its divisors is an integer number (1892970).

Almost surely, 2^68780040 is an apocalyptic number.

68780040 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 68780040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121150080).

68780040 is an abundant number, since it is smaller than the sum of its proper divisors (173520120).

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

68780040 is a wasteful number, since it uses less digits than its factorization.

68780040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2271 (or 2267 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 68780040 is about 8293.3732582104. The cubic root of 68780040 is about 409.7202930629.

The spelling of 68780040 in words is "sixty-eight million, seven hundred eighty thousand, forty".