67981536 has 72 divisors (see below), whose sum is σ = 220946544. Its totient is φ = 19422720.

The previous prime is 67981523. The next prime is 67981579. The reversal of 67981536 is 63518976.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (72).

It is a junction number, because it is equal to n+sod(n) for n = 67981491 and 67981500.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14845 + ... + 18876.

It is an arithmetic number, because the mean of its divisors is an integer number (3068702).

Almost surely, 2^67981536 is an apocalyptic number.

It is an amenable number.

67981536 is an abundant number, since it is smaller than the sum of its proper divisors (152965008).

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

67981536 is a wasteful number, since it uses less digits than its factorization.

67981536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33744 (or 33733 counting only the distinct ones).

The product of its digits is 272160, while the sum is 45.

The square root of 67981536 is about 8245.0916307825. The cubic root of 67981536 is about 408.1285638672.

It can be divided in two parts, 679 and 81536, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 67981536 in words is "sixty-seven million, nine hundred eighty-one thousand, five hundred thirty-six".