67791321 has 24 divisors (see below), whose sum is σ = 106282176. Its totient is φ = 41389920.

The previous prime is 67791319. The next prime is 67791371. The reversal of 67791321 is 12319776.

It is a happy number.

It is not a de Polignac number, because 67791321 - 2¹ = 67791319 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67791371) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13116 + ... + 17538.

It is an arithmetic number, because the mean of its divisors is an integer number (4428424).

Almost surely, 2^67791321 is an apocalyptic number.

It is an amenable number.

67791321 is a deficient number, since it is larger than the sum of its proper divisors (38490855).

67791321 is a wasteful number, since it uses less digits than its factorization.

67791321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4573 (or 4570 counting only the distinct ones).

The product of its digits is 15876, while the sum is 36.

The square root of 67791321 is about 8233.5485059602. The cubic root of 67791321 is about 407.7475550519.

It can be divided in two parts, 6779 and 1321, that added together give a square (8100 = 90²).

The spelling of 67791321 in words is "sixty-seven million, seven hundred ninety-one thousand, three hundred twenty-one".