68811840 has 84 divisors (see below), whose sum is σ = 236693964. Its totient is φ = 18349056.

The previous prime is 68811833. The next prime is 68811859. The reversal of 68811840 is 4811886.

It can be written as a sum of positive squares in 2 ways, for example, as 46457856 + 22353984 = 6816^2 + 4728^2 .

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 = 68811795 and 68811804.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9067 + ... + 14826.

Almost surely, 2^68811840 is an apocalyptic number.

68811840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68811840 is an abundant number, since it is smaller than the sum of its proper divisors (167882124).

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

68811840 is a wasteful number, since it uses less digits than its factorization.

68811840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23916 (or 23903 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 68811840 is about 8295.2902300040. The cubic root of 68811840 is about 409.7834271634.

The spelling of 68811840 in words is "sixty-eight million, eight hundred eleven thousand, eight hundred forty".