672721436 has 6 divisors (see below), whose sum is σ = 1177262520. Its totient is φ = 336360716.

The previous prime is 672721409. The next prime is 672721447. The reversal of 672721436 is 634127276.

It is an alternating number because its digits alternate between even and odd.

It is a self number, because there is not a number n which added to its sum of digits gives 672721436.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 84090176 + ... + 84090183.

It is an arithmetic number, because the mean of its divisors is an integer number (196210420).

Almost surely, 2^672721436 is an apocalyptic number.

It is an amenable number.

672721436 is a deficient number, since it is larger than the sum of its proper divisors (504541084).

672721436 is a wasteful number, since it uses less digits than its factorization.

672721436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168180363 (or 168180361 counting only the distinct ones).

The product of its digits is 84672, while the sum is 38.

The square root of 672721436 is about 25936.8740599171. The cubic root of 672721436 is about 876.2171625793.

The spelling of 672721436 in words is "six hundred seventy-two million, seven hundred twenty-one thousand, four hundred thirty-six".