68799840 has 48 divisors (see below), whose sum is σ = 216721008. Its totient is φ = 18346496.

The previous prime is 68799827. The next prime is 68799889. The reversal of 68799840 is 4899786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 71187 + ... + 72146.

It is an arithmetic number, because the mean of its divisors is an integer number (4515021).

Almost surely, 2^68799840 is an apocalyptic number.

68799840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68799840 is an abundant number, since it is smaller than the sum of its proper divisors (147921168).

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

68799840 is a wasteful number, since it uses less digits than its factorization.

68799840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143351 (or 143343 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 51.

The square root of 68799840 is about 8294.5668964690. The cubic root of 68799840 is about 409.7596052601.

The spelling of 68799840 in words is "sixty-eight million, seven hundred ninety-nine thousand, eight hundred forty".