67440738 has 16 divisors (see below), whose sum is σ = 140746176. Its totient is φ = 21502800.

The previous prime is 67440733. The next prime is 67440743. The reversal of 67440738 is 83704476.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (67440733) and next prime (67440743).

It is a junction number, because it is equal to n+sod(n) for n = 67440696 and 67440705.

It is not an unprimeable number, because it can be changed into a prime (67440733) 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 7 ways as a sum of consecutive naturals, for example, 244213 + ... + 244488.

It is an arithmetic number, because the mean of its divisors is an integer number (8796636).

Almost surely, 2^67440738 is an apocalyptic number.

67440738 is an abundant number, since it is smaller than the sum of its proper divisors (73305438).

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

67440738 is a wasteful number, since it uses less digits than its factorization.

67440738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 488729.

The product of its (nonzero) digits is 112896, while the sum is 39.

The square root of 67440738 is about 8212.2310001607. The cubic root of 67440738 is about 407.0434506994.

The spelling of 67440738 in words is "sixty-seven million, four hundred forty thousand, seven hundred thirty-eight".