128815436 has 6 divisors (see below), whose sum is σ = 225427020. Its totient is φ = 64407716.

The previous prime is 128815411. The next prime is 128815439. The reversal of 128815436 is 634518821.

It is a self number, because there is not a number n which added to its sum of digits gives 128815436.

It is not an unprimeable number, because it can be changed into a prime (128815439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16101926 + ... + 16101933.

It is an arithmetic number, because the mean of its divisors is an integer number (37571170).

Almost surely, 2^128815436 is an apocalyptic number.

It is an amenable number.

128815436 is a deficient number, since it is larger than the sum of its proper divisors (96611584).

128815436 is a wasteful number, since it uses less digits than its factorization.

128815436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32203863 (or 32203861 counting only the distinct ones).

The product of its digits is 46080, while the sum is 38.

The square root of 128815436 is about 11349.6888063065. The cubic root of 128815436 is about 505.0363480683.

The spelling of 128815436 in words is "one hundred twenty-eight million, eight hundred fifteen thousand, four hundred thirty-six".