642977673 has 16 divisors (see below), whose sum is σ = 963392640. Its totient is φ = 378474624.

The previous prime is 642977641. The next prime is 642977681. The reversal of 642977673 is 376779246.

It is a happy number.

It is not a de Polignac number, because 642977673 - 2⁵ = 642977641 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (642977623) 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, 357508 + ... + 359301.

It is an arithmetic number, because the mean of its divisors is an integer number (60212040).

Almost surely, 2^642977673 is an apocalyptic number.

It is an amenable number.

642977673 is a deficient number, since it is larger than the sum of its proper divisors (320414967).

642977673 is a wasteful number, since it uses less digits than its factorization.

642977673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 716848.

The product of its digits is 2667168, while the sum is 51.

The square root of 642977673 is about 25357.0044169259. The cubic root of 642977673 is about 863.1083090316.

The spelling of 642977673 in words is "six hundred forty-two million, nine hundred seventy-seven thousand, six hundred seventy-three".