128850728 has 8 divisors (see below), whose sum is σ = 241595130. Its totient is φ = 64425360.

The previous prime is 128850707. The next prime is 128850779. The reversal of 128850728 is 827058821.

It can be written as a sum of positive squares in only one way, i.e., 128640964 + 209764 = 11342^2 + 458^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×128850728² = 33205020212259968, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8053163 + ... + 8053178.

Almost surely, 2^128850728 is an apocalyptic number.

It is an amenable number.

128850728 is a deficient number, since it is larger than the sum of its proper divisors (112744402).

128850728 is a wasteful number, since it uses less digits than its factorization.

128850728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16106347 (or 16106343 counting only the distinct ones).

The product of its (nonzero) digits is 71680, while the sum is 41.

The square root of 128850728 is about 11351.2434561153. The cubic root of 128850728 is about 505.0824660281.

The spelling of 128850728 in words is "one hundred twenty-eight million, eight hundred fifty thousand, seven hundred twenty-eight".