68721259 has 4 divisors (see below), whose sum is σ = 72763704. Its totient is φ = 64678816.

The previous prime is 68721239. The next prime is 68721269. The reversal of 68721259 is 95212786.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 68721259 - 2⁷ = 68721131 is a prime.

It is a super-2 number, since 2×68721259² = 9445222877090162, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (68721239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2021197 + ... + 2021230.

It is an arithmetic number, because the mean of its divisors is an integer number (18190926).

Almost surely, 2^68721259 is an apocalyptic number.

68721259 is a deficient number, since it is larger than the sum of its proper divisors (4042445).

68721259 is a wasteful number, since it uses less digits than its factorization.

68721259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4042444.

The product of its digits is 60480, while the sum is 40.

The square root of 68721259 is about 8289.8286472038. The cubic root of 68721259 is about 409.6035410098.

The spelling of 68721259 in words is "sixty-eight million, seven hundred twenty-one thousand, two hundred fifty-nine".