672001981 has 8 divisors (see below), whose sum is σ = 768905280. Its totient is φ = 575324448.

The previous prime is 672001933. The next prime is 672001987. The reversal of 672001981 is 189100276.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 672001981 - 2⁷ = 672001853 is a prime.

It is a super-2 number, since 2×672001981² = 903173324935848722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672001987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 50011 + ... + 62008.

It is an arithmetic number, because the mean of its divisors is an integer number (96113160).

Almost surely, 2^672001981 is an apocalyptic number.

It is an amenable number.

672001981 is a deficient number, since it is larger than the sum of its proper divisors (96903299).

672001981 is a wasteful number, since it uses less digits than its factorization.

672001981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 112883.

The product of its (nonzero) digits is 6048, while the sum is 34.

The square root of 672001981 is about 25923.0010029703. The cubic root of 672001981 is about 875.9046886739.

The spelling of 672001981 in words is "six hundred seventy-two million, one thousand, nine hundred eighty-one".