67521320 has 32 divisors (see below), whose sum is σ = 152404200. Its totient is φ = 26923008.

The previous prime is 67521257. The next prime is 67521323. The reversal of 67521320 is 2312576.

It can be written as a sum of positive squares in 4 ways, for example, as 46158436 + 21362884 = 6794^2 + 4622^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 67521320.

It is not an unprimeable number, because it can be changed into a prime (67521323) 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, 10976 + ... + 15984.

Almost surely, 2^67521320 is an apocalyptic number.

It is an amenable number.

67521320 is an abundant number, since it is smaller than the sum of its proper divisors (84882880).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

67521320 is a wasteful number, since it uses less digits than its factorization.

67521320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5357 (or 5353 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 26.

The square root of 67521320 is about 8217.1357540204. The cubic root of 67521320 is about 407.2055056683.

Adding to 67521320 its reverse (2312576), we get a palindrome (69833896).

The spelling of 67521320 in words is "sixty-seven million, five hundred twenty-one thousand, three hundred twenty".