673642691 has 8 divisors (see below), whose sum is σ = 689426640. Its totient is φ = 658041472.

The previous prime is 673642657. The next prime is 673642709. The reversal of 673642691 is 196246376.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 673642691 - 2¹⁴ = 673626307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (673642621) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 38210 + ... + 52983.

It is an arithmetic number, because the mean of its divisors is an integer number (86178330).

Almost surely, 2^673642691 is an apocalyptic number.

673642691 is a deficient number, since it is larger than the sum of its proper divisors (15783949).

673642691 is an equidigital number, since it uses as much as digits as its factorization.

673642691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91365.

The product of its digits is 326592, while the sum is 44.

The square root of 673642691 is about 25954.6275450063. The cubic root of 673642691 is about 876.6169572036.

The spelling of 673642691 in words is "six hundred seventy-three million, six hundred forty-two thousand, six hundred ninety-one".