672912881 has 2 divisors, whose sum is σ = 672912882. Its totient is φ = 672912880.

The previous prime is 672912847. The next prime is 672912907. The reversal of 672912881 is 188219276.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 618019600 + 54893281 = 24860^2 + 7409^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-672912881 is a prime.

It is a super-2 number, since 2×672912881² = 905623490831440322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (672912811) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 336456440 + 336456441.

It is an arithmetic number, because the mean of its divisors is an integer number (336456441).

Almost surely, 2^672912881 is an apocalyptic number.

It is an amenable number.

672912881 is a deficient number, since it is larger than the sum of its proper divisors (1).

672912881 is an equidigital number, since it uses as much as digits as its factorization.

672912881 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 44.

The square root of 672912881 is about 25940.5643924723. The cubic root of 672912881 is about 876.3002734954.

The spelling of 672912881 in words is "six hundred seventy-two million, nine hundred twelve thousand, eight hundred eighty-one".