673939665 has 96 divisors (see below), whose sum is σ = 1368057600. Its totient is φ = 300584448.

The previous prime is 673939663. The next prime is 673939691. The reversal of 673939665 is 566939376.

It is a happy number.

It is not a de Polignac number, because 673939665 - 2¹ = 673939663 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

Its product of digits (5511240) is a multiple of the sum of its prime divisors (420).

It is not an unprimeable number, because it can be changed into a prime (673939661) 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 95 ways as a sum of consecutive naturals, for example, 3895519 + ... + 3895691.

It is an arithmetic number, because the mean of its divisors is an integer number (14250600).

Almost surely, 2^673939665 is an apocalyptic number.

It is an amenable number.

673939665 is an abundant number, since it is smaller than the sum of its proper divisors (694117935).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

673939665 is a wasteful number, since it uses less digits than its factorization.

673939665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 423 (or 420 counting only the distinct ones).

The product of its digits is 5511240, while the sum is 54.

The square root of 673939665 is about 25960.3479368055. The cubic root of 673939665 is about 876.7457565416.

The spelling of 673939665 in words is "six hundred seventy-three million, nine hundred thirty-nine thousand, six hundred sixty-five".