67657664 has 28 divisors (see below), whose sum is σ = 135166608. Its totient is φ = 33600000.

The previous prime is 67657663. The next prime is 67657669. The reversal of 67657664 is 46675676.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67657663) 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, 6164 + ... + 13164.

Almost surely, 2^67657664 is an apocalyptic number.

67657664 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

67657664 is a deficient number, since it is larger than the sum of its proper divisors (67508944).

67657664 is a wasteful number, since it uses less digits than its factorization.

67657664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7164 (or 7154 counting only the distinct ones).

The product of its digits is 1270080, while the sum is 47.

The square root of 67657664 is about 8225.4278916054. The cubic root of 67657664 is about 407.4794077943.

The spelling of 67657664 in words is "sixty-seven million, six hundred fifty-seven thousand, six hundred sixty-four".