68791440 has 80 divisors (see below), whose sum is σ = 218486016. Its totient is φ = 17894400.

The previous prime is 68791433. The next prime is 68791493. The reversal of 68791440 is 4419786.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6345 + ... + 13335.

Almost surely, 2^68791440 is an apocalyptic number.

68791440 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 68791440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109243008).

68791440 is an abundant number, since it is smaller than the sum of its proper divisors (149694576).

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

68791440 is a wasteful number, since it uses less digits than its factorization.

68791440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7048 (or 7042 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 68791440 is about 8294.0605254604. The cubic root of 68791440 is about 409.7429282795.

The spelling of 68791440 in words is "sixty-eight million, seven hundred ninety-one thousand, four hundred forty".