128692025 has 24 divisors (see below), whose sum is σ = 198957504. Its totient is φ = 80222400.

The previous prime is 128692013. The next prime is 128692033. The reversal of 128692025 is 520296821.

It is a happy number.

It is not a de Polignac number, because 128692025 - 2¹⁰ = 128691001 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (35).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31502 + ... + 35351.

It is an arithmetic number, because the mean of its divisors is an integer number (8289896).

Almost surely, 2^128692025 is an apocalyptic number.

It is an amenable number.

128692025 is a deficient number, since it is larger than the sum of its proper divisors (70265479).

128692025 is a wasteful number, since it uses less digits than its factorization.

128692025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66881 (or 66876 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 35.

The square root of 128692025 is about 11344.2507465235. The cubic root of 128692025 is about 504.8750139991.

The spelling of 128692025 in words is "one hundred twenty-eight million, six hundred ninety-two thousand, twenty-five".