68199840 has 96 divisors (see below), whose sum is σ = 238714560. Its totient is φ = 18185472.

The previous prime is 68199829. The next prime is 68199847. The reversal of 68199840 is 4899186.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (68199847) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3574 + ... + 12213.

It is an arithmetic number, because the mean of its divisors is an integer number (2486610).

Almost surely, 2^68199840 is an apocalyptic number.

68199840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68199840 is an abundant number, since it is smaller than the sum of its proper divisors (170514720).

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

68199840 is a wasteful number, since it uses less digits than its factorization.

68199840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15811 (or 15797 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 68199840 is about 8258.3194416298. The cubic root of 68199840 is about 408.5649612766.

The spelling of 68199840 in words is "sixty-eight million, one hundred ninety-nine thousand, eight hundred forty".