67961409 has 16 divisors (see below), whose sum is σ = 92467200. Its totient is φ = 44390736.

The previous prime is 67961407. The next prime is 67961431. The reversal of 67961409 is 90416976.

It is not a de Polignac number, because 67961409 - 2¹ = 67961407 is a prime.

It is a super-2 number, since 2×67961409² = 9237506226530562, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (67961407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31912 + ... + 33974.

It is an arithmetic number, because the mean of its divisors is an integer number (5779200).

Almost surely, 2^67961409 is an apocalyptic number.

It is an amenable number.

67961409 is a deficient number, since it is larger than the sum of its proper divisors (24505791).

67961409 is a wasteful number, since it uses less digits than its factorization.

67961409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2284.

The product of its (nonzero) digits is 81648, while the sum is 42.

The square root of 67961409 is about 8243.8709960795. The cubic root of 67961409 is about 408.0882822707.

The spelling of 67961409 in words is "sixty-seven million, nine hundred sixty-one thousand, four hundred nine".