68390240 has 24 divisors (see below), whose sum is σ = 161572320. Its totient is φ = 27356032.

The previous prime is 68390239. The next prime is 68390243. The reversal of 68390240 is 4209386.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 68390197 and 68390206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68390243) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213560 + ... + 213879.

It is an arithmetic number, because the mean of its divisors is an integer number (6732180).

Almost surely, 2^68390240 is an apocalyptic number.

It is an amenable number.

68390240 is an abundant number, since it is smaller than the sum of its proper divisors (93182080).

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

68390240 is a wasteful number, since it uses less digits than its factorization.

68390240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427454 (or 427446 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 32.

The square root of 68390240 is about 8269.8391761872. The cubic root of 68390240 is about 408.9448179289.

The spelling of 68390240 in words is "sixty-eight million, three hundred ninety thousand, two hundred forty".