67641749 has 4 divisors (see below), whose sum is σ = 77304864. Its totient is φ = 57978636.

The previous prime is 67641701. The next prime is 67641779. The reversal of 67641749 is 94714676.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-67641749 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (67641779) 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, 4831547 + ... + 4831560.

It is an arithmetic number, because the mean of its divisors is an integer number (19326216).

Almost surely, 2^67641749 is an apocalyptic number.

It is an amenable number.

67641749 is a deficient number, since it is larger than the sum of its proper divisors (9663115).

67641749 is an equidigital number, since it uses as much as digits as its factorization.

67641749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9663114.

The product of its digits is 254016, while the sum is 44.

The square root of 67641749 is about 8224.4604078322. The cubic root of 67641749 is about 407.4474550538.

The spelling of 67641749 in words is "sixty-seven million, six hundred forty-one thousand, seven hundred forty-nine".