728503128 has 48 divisors (see below), whose sum is σ = 1980056520. Its totient is φ = 241969536.

The previous prime is 728503109. The next prime is 728503133. The reversal of 728503128 is 821305827.

728503128 is a `hidden beast` number, since 7 + 28 + 503 + 128 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 728503092 and 728503101.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2500 + ... + 38252.

Almost surely, 2^728503128 is an apocalyptic number.

It is an amenable number.

728503128 is an abundant number, since it is smaller than the sum of its proper divisors (1251553392).

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

728503128 is a wasteful number, since it uses less digits than its factorization.

728503128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36048 (or 36041 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 728503128 is about 26990.7970982704. The cubic root of 728503128 is about 899.7954794532.

The spelling of 728503128 in words is "seven hundred twenty-eight million, five hundred three thousand, one hundred twenty-eight".