67564638 has 32 divisors (see below), whose sum is σ = 153810720. Its totient is φ = 21971520.

The previous prime is 67564633. The next prime is 67564643. The reversal of 67564638 is 83646576.

67564638 is a `hidden beast` number, since 6 + 7 + 5 + 6 + 4 + 638 = 666.

It is an interprime number because it is at equal distance from previous prime (67564633) and next prime (67564643).

It is a junction number, because it is equal to n+sod(n) for n = 67564593 and 67564602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67564633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13045 + ... + 17472.

It is an arithmetic number, because the mean of its divisors is an integer number (4806585).

Almost surely, 2^67564638 is an apocalyptic number.

67564638 is an abundant number, since it is smaller than the sum of its proper divisors (86246082).

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

67564638 is a wasteful number, since it uses less digits than its factorization.

67564638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30569 (or 30563 counting only the distinct ones).

The product of its digits is 725760, while the sum is 45.

The square root of 67564638 is about 8219.7711646980. The cubic root of 67564638 is about 407.2925673415.

It can be divided in two parts, 675646 and 38, that added together give a square (675684 = 822²).

The spelling of 67564638 in words is "sixty-seven million, five hundred sixty-four thousand, six hundred thirty-eight".