67949409 has 16 divisors (see below), whose sum is σ = 99800064. Its totient is φ = 40779600.

The previous prime is 67949393. The next prime is 67949419. The reversal of 67949409 is 90494976.

It is not a de Polignac number, because 67949409 - 2⁴ = 67949393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (67949419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6597 + ... + 13394.

It is an arithmetic number, because the mean of its divisors is an integer number (6237504).

Almost surely, 2^67949409 is an apocalyptic number.

It is an amenable number.

67949409 is a deficient number, since it is larger than the sum of its proper divisors (31850655).

67949409 is a wasteful number, since it uses less digits than its factorization.

67949409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20108.

The product of its (nonzero) digits is 489888, while the sum is 48.

The square root of 67949409 is about 8243.1431505221. The cubic root of 67949409 is about 408.0642620328.

The spelling of 67949409 in words is "sixty-seven million, nine hundred forty-nine thousand, four hundred nine".