728791644 has 48 divisors (see below), whose sum is σ = 1975318016. Its totient is φ = 204811200.

The previous prime is 728791643. The next prime is 728791667. The reversal of 728791644 is 446197827.

It is a super-2 number, since 2×728791644² = 1062274520728445472, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 728791593 and 728791602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728791643) 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, 65992 + ... + 76239.

Almost surely, 2^728791644 is an apocalyptic number.

It is an amenable number.

728791644 is an abundant number, since it is smaller than the sum of its proper divisors (1246526372).

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

728791644 is a wasteful number, since it uses less digits than its factorization.

728791644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142306 (or 142304 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 728791644 is about 26996.1412798200. The cubic root of 728791644 is about 899.9142486201.

The spelling of 728791644 in words is "seven hundred twenty-eight million, seven hundred ninety-one thousand, six hundred forty-four".