67438656 has 70 divisors (see below), whose sum is σ = 199924670. Its totient is φ = 22477824.

The previous prime is 67438633. The next prime is 67438673. The reversal of 67438656 is 65683476.

It can be written as a sum of positive squares in only one way, i.e., 48776256 + 18662400 = 6984^2 + 4320^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1321 + ... + 11688.

Almost surely, 2^67438656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67438656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99962335).

67438656 is an abundant number, since it is smaller than the sum of its proper divisors (132486014).

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

67438656 is a wasteful number, since it uses less digits than its factorization.

67438656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13033 (or 13014 counting only the distinct ones).

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

The square root of 67438656 is about 8212.1042370394. The cubic root of 67438656 is about 407.0392619691.

The spelling of 67438656 in words is "sixty-seven million, four hundred thirty-eight thousand, six hundred fifty-six".