67491605 has 4 divisors (see below), whose sum is σ = 80989932. Its totient is φ = 53993280.

The previous prime is 67491587. The next prime is 67491607. The reversal of 67491605 is 50619476.

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 18028516 + 49463089 = 4246^2 + 7033^2 .

It is not a de Polignac number, because 67491605 - 2⁸ = 67491349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67491607) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6749156 + ... + 6749165.

It is an arithmetic number, because the mean of its divisors is an integer number (20247483).

Almost surely, 2^67491605 is an apocalyptic number.

It is an amenable number.

67491605 is a deficient number, since it is larger than the sum of its proper divisors (13498327).

67491605 is a wasteful number, since it uses less digits than its factorization.

67491605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13498326.

The product of its (nonzero) digits is 45360, while the sum is 38.

The square root of 67491605 is about 8215.3274432612. The cubic root of 67491605 is about 407.1457621332.

The spelling of 67491605 in words is "sixty-seven million, four hundred ninety-one thousand, six hundred five".