728899428 has 12 divisors (see below), whose sum is σ = 1700765360. Its totient is φ = 242966472.

The previous prime is 728899421. The next prime is 728899441. The reversal of 728899428 is 824998827.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×728899428² = 1062588752277454368, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728899421) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30370798 + ... + 30370821.

Almost surely, 2^728899428 is an apocalyptic number.

It is an amenable number.

728899428 is an abundant number, since it is smaller than the sum of its proper divisors (971865932).

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

728899428 is a wasteful number, since it uses less digits than its factorization.

728899428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60741626 (or 60741624 counting only the distinct ones).

The product of its digits is 4644864, while the sum is 57.

The square root of 728899428 is about 26998.1374913160. The cubic root of 728899428 is about 899.9586104423.

The spelling of 728899428 in words is "seven hundred twenty-eight million, eight hundred ninety-nine thousand, four hundred twenty-eight".