68121865 has 16 divisors (see below), whose sum is σ = 93582720. Its totient is φ = 46632960.

The previous prime is 68121863. The next prime is 68121877. The reversal of 68121865 is 56812186.

68121865 = 1253² + 1254² + ... + 1294².

It is not a de Polignac number, because 68121865 - 2¹ = 68121863 is a prime.

It is not an unprimeable number, because it can be changed into a prime (68121863) 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, 25650 + ... + 28180.

It is an arithmetic number, because the mean of its divisors is an integer number (5848920).

Almost surely, 2^68121865 is an apocalyptic number.

It is an amenable number.

68121865 is a deficient number, since it is larger than the sum of its proper divisors (25460855).

68121865 is a wasteful number, since it uses less digits than its factorization.

68121865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3312.

The product of its digits is 23040, while the sum is 37.

The square root of 68121865 is about 8253.5970946006. The cubic root of 68121865 is about 408.4091935508.

It can be divided in two parts, 68121 and 865, that added together give a palindrome (68986).

The spelling of 68121865 in words is "sixty-eight million, one hundred twenty-one thousand, eight hundred sixty-five".