68217615 has 12 divisors (see below), whose sum is σ = 118243944. Its totient is φ = 36382704.

The previous prime is 68217613. The next prime is 68217641. The reversal of 68217615 is 51671286.

It is not a de Polignac number, because 68217615 - 2¹ = 68217613 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 68217615.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68217613) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 757929 + ... + 758018.

It is an arithmetic number, because the mean of its divisors is an integer number (9853662).

Almost surely, 2^68217615 is an apocalyptic number.

68217615 is a deficient number, since it is larger than the sum of its proper divisors (50026329).

68217615 is a wasteful number, since it uses less digits than its factorization.

68217615 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1515958 (or 1515955 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 68217615 is about 8259.3955589982. The cubic root of 68217615 is about 408.6004531064.

The spelling of 68217615 in words is "sixty-eight million, two hundred seventeen thousand, six hundred fifteen".