673139865 has 16 divisors (see below), whose sum is σ = 1078259328. Its totient is φ = 358596096.

The previous prime is 673139861. The next prime is 673139867. The reversal of 673139865 is 568931376.

It is a happy number.

It is not a de Polignac number, because 673139865 - 2² = 673139861 is a prime.

It is not an unprimeable number, because it can be changed into a prime (673139861) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11992 + ... + 38601.

It is an arithmetic number, because the mean of its divisors is an integer number (67391208).

Almost surely, 2^673139865 is an apocalyptic number.

It is an amenable number.

673139865 is a deficient number, since it is larger than the sum of its proper divisors (405119463).

673139865 is a wasteful number, since it uses less digits than its factorization.

673139865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51488.

The product of its digits is 816480, while the sum is 48.

The square root of 673139865 is about 25944.9391018750. The cubic root of 673139865 is about 876.3987923312.

The spelling of 673139865 in words is "six hundred seventy-three million, one hundred thirty-nine thousand, eight hundred sixty-five".