68664240 has 160 divisors (see below), whose sum is σ = 239984640. Its totient is φ = 18042624.

The previous prime is 68664209. The next prime is 68664251. The reversal of 68664240 is 4246686.

It is a happy number.

68664240 is a `hidden beast` number, since 6 + 8 + 6 + 642 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 68664195 and 68664204.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 179089 + ... + 179471.

It is an arithmetic number, because the mean of its divisors is an integer number (1499904).

Almost surely, 2^68664240 is an apocalyptic number.

68664240 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 68664240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (119992320).

68664240 is an abundant number, since it is smaller than the sum of its proper divisors (171320400).

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

68664240 is a wasteful number, since it uses less digits than its factorization.

68664240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 488 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 68664240 is about 8286.3888395368. The cubic root of 68664240 is about 409.4902250481.

The spelling of 68664240 in words is "sixty-eight million, six hundred sixty-four thousand, two hundred forty".