68430240 has 72 divisors (see below), whose sum is σ = 233523108. Its totient is φ = 18247680.

The previous prime is 68430223. The next prime is 68430259. The reversal of 68430240 is 4203486.

It can be written as a sum of positive squares in 2 ways, for example, as 66781584 + 1648656 = 8172^2 + 1284^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22321 + ... + 25200.

Almost surely, 2^68430240 is an apocalyptic number.

68430240 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68430240 is an abundant number, since it is smaller than the sum of its proper divisors (165092868).

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

68430240 is a wasteful number, since it uses less digits than its factorization.

68430240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47542 (or 47531 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

The square root of 68430240 is about 8272.2572493848. The cubic root of 68430240 is about 409.0245301054.

The spelling of 68430240 in words is "sixty-eight million, four hundred thirty thousand, two hundred forty".