67991274 has 48 divisors (see below), whose sum is σ = 162954792. Its totient is φ = 20352384.

The previous prime is 67991269. The next prime is 67991293. The reversal of 67991274 is 47219976.

It can be written as a sum of positive squares in 4 ways, for example, as 41024025 + 26967249 = 6405^2 + 5193^2 .

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4732 + ... + 12584.

Almost surely, 2^67991274 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 67991274, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81477396).

67991274 is an abundant number, since it is smaller than the sum of its proper divisors (94963518).

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

67991274 is a wasteful number, since it uses less digits than its factorization.

67991274 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7911 (or 7908 counting only the distinct ones).

The product of its digits is 190512, while the sum is 45.

The square root of 67991274 is about 8245.6821427945. The cubic root of 67991274 is about 408.1480503653.

It can be divided in two parts, 67991 and 274, that added together give a triangular number (68265 = T₃₆₉).

The spelling of 67991274 in words is "sixty-seven million, nine hundred ninety-one thousand, two hundred seventy-four".