68030640 has 120 divisors (see below), whose sum is σ = 240542640. Its totient is φ = 17183232.

The previous prime is 68030639. The next prime is 68030663. The reversal of 68030640 is 4603086.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11194 + ... + 16166.

It is an arithmetic number, because the mean of its divisors is an integer number (2004522).

Almost surely, 2^68030640 is an apocalyptic number.

68030640 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 68030640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120271320).

68030640 is an abundant number, since it is smaller than the sum of its proper divisors (172512000).

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

68030640 is a wasteful number, since it uses less digits than its factorization.

68030640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5011 (or 5002 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 68030640 is about 8248.0688648920. The cubic root of 68030640 is about 408.2268058453.

The spelling of 68030640 in words is "sixty-eight million, thirty thousand, six hundred forty".