68403840 has 128 divisors (see below), whose sum is σ = 227664000. Its totient is φ = 17436672.

The previous prime is 68403827. The next prime is 68403871. The reversal of 68403840 is 4830486.

It is a tau number, because it is divible by the number of its divisors (128).

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, 43386 + ... + 44934.

It is an arithmetic number, because the mean of its divisors is an integer number (1778625).

Almost surely, 2^68403840 is an apocalyptic number.

68403840 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 68403840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (113832000).

68403840 is an abundant number, since it is smaller than the sum of its proper divisors (159260160).

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

68403840 is a wasteful number, since it uses less digits than its factorization.

68403840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1594 (or 1582 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 33.

The square root of 68403840 is about 8270.6614003960. The cubic root of 68403840 is about 408.9719235554.

The spelling of 68403840 in words is "sixty-eight million, four hundred three thousand, eight hundred forty".