67440399 has 16 divisors (see below), whose sum is σ = 100178400. Its totient is φ = 40070016.

The previous prime is 67440353. The next prime is 67440403. The reversal of 67440399 is 99304476.

It is not a de Polignac number, because 67440399 - 2¹¹ = 67438351 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 67440399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67440199) 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, 28684 + ... + 30945.

It is an arithmetic number, because the mean of its divisors is an integer number (6261150).

Almost surely, 2^67440399 is an apocalyptic number.

67440399 is a deficient number, since it is larger than the sum of its proper divisors (32738001).

67440399 is a wasteful number, since it uses less digits than its factorization.

67440399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59674.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 67440399 is about 8212.2103601893. The cubic root of 67440399 is about 407.0427686786.

The spelling of 67440399 in words is "sixty-seven million, four hundred forty thousand, three hundred ninety-nine".