672745081 has 4 divisors (see below), whose sum is σ = 684147600. Its totient is φ = 661342564.

The previous prime is 672745079. The next prime is 672745121. The reversal of 672745081 is 180547276.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 672745081 - 2¹ = 672745079 is a prime.

It is a super-3 number, since 3×672745081³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (672745061) 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 3 ways as a sum of consecutive naturals, for example, 5701171 + ... + 5701288.

It is an arithmetic number, because the mean of its divisors is an integer number (171036900).

Almost surely, 2^672745081 is an apocalyptic number.

It is an amenable number.

672745081 is a deficient number, since it is larger than the sum of its proper divisors (11402519).

672745081 is a wasteful number, since it uses less digits than its factorization.

672745081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11402518.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 672745081 is about 25937.3298741409. The cubic root of 672745081 is about 876.2274283005.

The spelling of 672745081 in words is "six hundred seventy-two million, seven hundred forty-five thousand, eighty-one".