128520136 has 64 divisors (see below), whose sum is σ = 268894080. Its totient is φ = 57277440.

The previous prime is 128520131. The next prime is 128520149. The reversal of 128520136 is 631025821.

It is not an unprimeable number, because it can be changed into a prime (128520131) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566055 + ... + 566281.

It is an arithmetic number, because the mean of its divisors is an integer number (4201470).

Almost surely, 2^128520136 is an apocalyptic number.

It is an amenable number.

128520136 is an abundant number, since it is smaller than the sum of its proper divisors (140373944).

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

128520136 is a wasteful number, since it uses less digits than its factorization.

128520136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454 (or 450 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 128520136 is about 11336.6721748492. The cubic root of 128520136 is about 504.6501331196.

Adding to 128520136 its reverse (631025821), we get a palindrome (759545957).

The spelling of 128520136 in words is "one hundred twenty-eight million, five hundred twenty thousand, one hundred thirty-six".