68666820 has 48 divisors (see below), whose sum is σ = 197469888. Its totient is φ = 17815680.

The previous prime is 68666803. The next prime is 68666821. The reversal of 68666820 is 2866686.

It is not an unprimeable number, because it can be changed into a prime (68666821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13246 + ... + 17685.

It is an arithmetic number, because the mean of its divisors is an integer number (4113956).

Almost surely, 2^68666820 is an apocalyptic number.

68666820 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

68666820 is an abundant number, since it is smaller than the sum of its proper divisors (128803068).

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

68666820 is a wasteful number, since it uses less digits than its factorization.

68666820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30980 (or 30978 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 68666820 is about 8286.5445150557. The cubic root of 68666820 is about 409.4953537320.

The spelling of 68666820 in words is "sixty-eight million, six hundred sixty-six thousand, eight hundred twenty".