68728229 has 8 divisors (see below), whose sum is σ = 73194840. Its totient is φ = 64308736.

The previous prime is 68728217. The next prime is 68728249. The reversal of 68728229 is 92282786.

It can be written as a sum of positive squares in 4 ways, for example, as 19377604 + 49350625 = 4402^2 + 7025^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 68728229 - 2²⁴ = 51951013 is a prime.

It is a super-2 number, since 2×68728229² = 9447138922952882, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 68728229.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (68728249) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8744 + ... + 14625.

It is an arithmetic number, because the mean of its divisors is an integer number (9149355).

Almost surely, 2^68728229 is an apocalyptic number.

It is an amenable number.

68728229 is a deficient number, since it is larger than the sum of its proper divisors (4466611).

68728229 is a wasteful number, since it uses less digits than its factorization.

68728229 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23559.

The product of its digits is 193536, while the sum is 44.

The square root of 68728229 is about 8290.2490312415. The cubic root of 68728229 is about 409.6173884480.

The spelling of 68728229 in words is "sixty-eight million, seven hundred twenty-eight thousand, two hundred twenty-nine".