67728291 has 4 divisors (see below), whose sum is σ = 90304392. Its totient is φ = 45152192.

The previous prime is 67728281. The next prime is 67728299. The reversal of 67728291 is 19282776.

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 67728291 - 2⁵ = 67728259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67728299) 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, 11288046 + ... + 11288051.

It is an arithmetic number, because the mean of its divisors is an integer number (22576098).

Almost surely, 2^67728291 is an apocalyptic number.

67728291 is a deficient number, since it is larger than the sum of its proper divisors (22576101).

67728291 is a wasteful number, since it uses less digits than its factorization.

67728291 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22576100.

The product of its digits is 84672, while the sum is 42.

The square root of 67728291 is about 8229.7199830857. The cubic root of 67728291 is about 407.6211460602.

The spelling of 67728291 in words is "sixty-seven million, seven hundred twenty-eight thousand, two hundred ninety-one".