67521389 has 8 divisors (see below), whose sum is σ = 72815232. Its totient is φ = 62241840.

The previous prime is 67521373. The next prime is 67521437. The reversal of 67521389 is 98312576.

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 67521389 - 2⁴ = 67521373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67521989) 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, 7544 + ... + 13854.

It is an arithmetic number, because the mean of its divisors is an integer number (9101904).

Almost surely, 2^67521389 is an apocalyptic number.

It is an amenable number.

67521389 is a deficient number, since it is larger than the sum of its proper divisors (5293843).

67521389 is a wasteful number, since it uses less digits than its factorization.

67521389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7147.

The product of its digits is 90720, while the sum is 41.

The square root of 67521389 is about 8217.1399525626. The cubic root of 67521389 is about 407.2056443759.

The spelling of 67521389 in words is "sixty-seven million, five hundred twenty-one thousand, three hundred eighty-nine".