68705820 has 144 divisors (see below), whose sum is σ = 220391808. Its totient is φ = 17962560.

The previous prime is 68705783. The next prime is 68705831. The reversal of 68705820 is 2850786.

68705820 is a `hidden beast` number, since 6 + 8 + 70 + 582 + 0 = 666.

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

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 325515 + ... + 325725.

Almost surely, 2^68705820 is an apocalyptic number.

68705820 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 68705820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (110195904).

68705820 is an abundant number, since it is smaller than the sum of its proper divisors (151685988).

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

68705820 is a wasteful number, since it uses less digits than its factorization.

68705820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 302 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 68705820 is about 8288.8973935017. The cubic root of 68705820 is about 409.5728647058.

The spelling of 68705820 in words is "sixty-eight million, seven hundred five thousand, eight hundred twenty".