1672747728 has 80 divisors (see below), whose sum is σ = 4414050816. Its totient is φ = 545719680.

The previous prime is 1672747711. The next prime is 1672747729. The reversal of 1672747728 is 8277472761.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1672747729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 522613 + ... + 525803.

Almost surely, 2^1672747728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1672747728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2207025408).

1672747728 is an abundant number, since it is smaller than the sum of its proper divisors (2741303088).

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

1672747728 is a wasteful number, since it uses less digits than its factorization.

1672747728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3432 (or 3426 counting only the distinct ones).

The product of its digits is 1843968, while the sum is 51.

The square root of 1672747728 is about 40899.2387215215. The cubic root of 1672747728 is about 1187.0713303797.

The spelling of 1672747728 in words is "one billion, six hundred seventy-two million, seven hundred forty-seven thousand, seven hundred twenty-eight".