67490905 has 4 divisors (see below), whose sum is σ = 80989092. Its totient is φ = 53992720.

The previous prime is 67490903. The next prime is 67490939. The reversal of 67490905 is 50909476.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 29680704 + 37810201 = 5448^2 + 6149^2 .

It is not a de Polignac number, because 67490905 - 2¹ = 67490903 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (67490903) 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 3 ways as a sum of consecutive naturals, for example, 6749086 + ... + 6749095.

It is an arithmetic number, because the mean of its divisors is an integer number (20247273).

Almost surely, 2^67490905 is an apocalyptic number.

It is an amenable number.

67490905 is a deficient number, since it is larger than the sum of its proper divisors (13498187).

67490905 is a wasteful number, since it uses less digits than its factorization.

67490905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13498186.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 67490905 is about 8215.2848398580. The cubic root of 67490905 is about 407.1443545358.

The spelling of 67490905 in words is "sixty-seven million, four hundred ninety thousand, nine hundred five".