128525816 has 16 divisors (see below), whose sum is σ = 246864240. Its totient is φ = 62695360.

The previous prime is 128525809. The next prime is 128525821. The reversal of 128525816 is 618525821.

It is a super-3 number, since 3×128525816³ (a number of 25 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128525816.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 195596 + ... + 196251.

It is an arithmetic number, because the mean of its divisors is an integer number (15429015).

Almost surely, 2^128525816 is an apocalyptic number.

It is an amenable number.

128525816 is a deficient number, since it is larger than the sum of its proper divisors (118338424).

128525816 is a wasteful number, since it uses less digits than its factorization.

128525816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391894 (or 391890 counting only the distinct ones).

The product of its digits is 38400, while the sum is 38.

The square root of 128525816 is about 11336.9226865142. The cubic root of 128525816 is about 504.6575674165.

The spelling of 128525816 in words is "one hundred twenty-eight million, five hundred twenty-five thousand, eight hundred sixteen".