67490921 has 4 divisors (see below), whose sum is σ = 67564500. Its totient is φ = 67417344.

The previous prime is 67490903. The next prime is 67490939. The reversal of 67490921 is 12909476.

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

It is an interprime number because it is at equal distance from previous prime (67490903) and next prime (67490939).

It can be written as a sum of positive squares in 2 ways, for example, as 7645225 + 59845696 = 2765^2 + 7736^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67490921 is a prime.

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 (67490981) 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, 35396 + ... + 37253.

It is an arithmetic number, because the mean of its divisors is an integer number (16891125).

Almost surely, 2^67490921 is an apocalyptic number.

It is an amenable number.

67490921 is a deficient number, since it is larger than the sum of its proper divisors (73579).

67490921 is an equidigital number, since it uses as much as digits as its factorization.

67490921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 73578.

The product of its (nonzero) digits is 27216, while the sum is 38.

The square root of 67490921 is about 8215.2858136525. The cubic root of 67490921 is about 407.1443867096.

The spelling of 67490921 in words is "sixty-seven million, four hundred ninety thousand, nine hundred twenty-one".