672721105 has 32 divisors (see below), whose sum is σ = 951782400. Its totient is φ = 446899200.

The previous prime is 672721099. The next prime is 672721109. The reversal of 672721105 is 501127276.

672721105 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 672721105 - 2³ = 672721097 is a prime.

It is a super-2 number, since 2×672721105² = 905107370224842050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (672721109) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 164121 + ... + 168169.

It is an arithmetic number, because the mean of its divisors is an integer number (29743200).

Almost surely, 2^672721105 is an apocalyptic number.

It is an amenable number.

672721105 is a deficient number, since it is larger than the sum of its proper divisors (279061295).

672721105 is a wasteful number, since it uses less digits than its factorization.

672721105 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4209.

The product of its (nonzero) digits is 5880, while the sum is 31.

The square root of 672721105 is about 25936.8676790394. The cubic root of 672721105 is about 876.2170188705.

The spelling of 672721105 in words is "six hundred seventy-two million, seven hundred twenty-one thousand, one hundred five".