672121629 has 12 divisors (see below), whose sum is σ = 972643932. Its totient is φ = 447249600.

The previous prime is 672121609. The next prime is 672121643. The reversal of 672121629 is 926121276.

672121629 is a `hidden beast` number, since 6 + 7 + 2 + 1 + 21 + 629 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 518609529 + 153512100 = 22773^2 + 12390^2 .

It is not a de Polignac number, because 672121629 - 2⁷ = 672121501 is a prime.

It is a super-2 number, since 2×672121629² = 903494968339227282, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 672121593 and 672121602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (672121609) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64152 + ... + 73889.

It is an arithmetic number, because the mean of its divisors is an integer number (81053661).

Almost surely, 2^672121629 is an apocalyptic number.

It is an amenable number.

672121629 is a deficient number, since it is larger than the sum of its proper divisors (300522303).

672121629 is a wasteful number, since it uses less digits than its factorization.

672121629 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138588 (or 138585 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 672121629 is about 25925.3086577576. The cubic root of 672121629 is about 875.9566696839.

The spelling of 672121629 in words is "six hundred seventy-two million, one hundred twenty-one thousand, six hundred twenty-nine".