672721434 has 192 divisors, whose sum is σ = 1940889600. Its totient is φ = 163215360.

The previous prime is 672721409. The next prime is 672721447. The reversal of 672721434 is 434127276.

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

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1498042 + ... + 1498490.

It is an arithmetic number, because the mean of its divisors is an integer number (10108800).

Almost surely, 2^672721434 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 672721434, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (970444800).

672721434 is an abundant number, since it is smaller than the sum of its proper divisors (1268168166).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

672721434 is a wasteful number, since it uses less digits than its factorization.

672721434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545 (or 542 counting only the distinct ones).

The product of its digits is 56448, while the sum is 36.

The square root of 672721434 is about 25936.8740213619. The cubic root of 672721434 is about 876.2171617110.

The spelling of 672721434 in words is "six hundred seventy-two million, seven hundred twenty-one thousand, four hundred thirty-four".