672308781 has 8 divisors (see below), whose sum is σ = 898671264. Its totient is φ = 447076080.

The previous prime is 672308773. The next prime is 672308789. The reversal of 672308781 is 187803276.

It is an interprime number because it is at equal distance from previous prime (672308773) and next prime (672308789).

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

It is not a de Polignac number, because 672308781 - 2³ = 672308773 is a prime.

It is a super-2 number, since 2×672308781² = 903998194019411922, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672308789) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 281055 + ... + 283436.

It is an arithmetic number, because the mean of its divisors is an integer number (112333908).

Almost surely, 2^672308781 is an apocalyptic number.

It is an amenable number.

672308781 is a deficient number, since it is larger than the sum of its proper divisors (226362483).

672308781 is a wasteful number, since it uses less digits than its factorization.

672308781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564891.

The product of its (nonzero) digits is 112896, while the sum is 42.

The square root of 672308781 is about 25928.9178524673. The cubic root of 672308781 is about 876.0379654007.

The spelling of 672308781 in words is "six hundred seventy-two million, three hundred eight thousand, seven hundred eighty-one".