67764521 has 8 divisors (see below), whose sum is σ = 74002464. Its totient is φ = 61539520.

The previous prime is 67764467. The next prime is 67764527. The reversal of 67764521 is 12546776.

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 67764521 - 2²⁶ = 655657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67764527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10145 + ... + 15441.

It is an arithmetic number, because the mean of its divisors is an integer number (9250308).

Almost surely, 2^67764521 is an apocalyptic number.

It is an amenable number.

67764521 is a deficient number, since it is larger than the sum of its proper divisors (6237943).

67764521 is a wasteful number, since it uses less digits than its factorization.

67764521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6471.

The product of its digits is 70560, while the sum is 38.

The square root of 67764521 is about 8231.9208572483. The cubic root of 67764521 is about 407.6938162416.

The spelling of 67764521 in words is "sixty-seven million, seven hundred sixty-four thousand, five hundred twenty-one".