68121860 has 24 divisors (see below), whose sum is σ = 149276736. Its totient is φ = 26063840.

The previous prime is 68121857. The next prime is 68121863. The reversal of 68121860 is 6812186.

It is an interprime number because it is at equal distance from previous prime (68121857) and next prime (68121863).

It is not an unprimeable number, because it can be changed into a prime (68121863) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 73586 + ... + 74505.

It is an arithmetic number, because the mean of its divisors is an integer number (6219864).

Almost surely, 2^68121860 is an apocalyptic number.

It is an amenable number.

68121860 is an abundant number, since it is smaller than the sum of its proper divisors (81154876).

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

68121860 is a wasteful number, since it uses less digits than its factorization.

68121860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148123 (or 148121 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 32.

The square root of 68121860 is about 8253.5967917024. The cubic root of 68121860 is about 408.4091835586.

The spelling of 68121860 in words is "sixty-eight million, one hundred twenty-one thousand, eight hundred sixty".