68391824 has 10 divisors (see below), whose sum is σ = 132509190. Its totient is φ = 34195904.

The previous prime is 68391821. The next prime is 68391839. The reversal of 68391824 is 42819386.

It can be written as a sum of positive squares in only one way, i.e., 46676224 + 21715600 = 6832^2 + 4660^2 .

It is not an unprimeable number, because it can be changed into a prime (68391821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2137229 + ... + 2137260.

It is an arithmetic number, because the mean of its divisors is an integer number (13250919).

Almost surely, 2^68391824 is an apocalyptic number.

It is an amenable number.

68391824 is a deficient number, since it is larger than the sum of its proper divisors (64117366).

68391824 is a wasteful number, since it uses less digits than its factorization.

68391824 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4274497 (or 4274491 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 68391824 is about 8269.9349453306. The cubic root of 68391824 is about 408.9479751220.

The spelling of 68391824 in words is "sixty-eight million, three hundred ninety-one thousand, eight hundred twenty-four".