128730236 has 6 divisors (see below), whose sum is σ = 225277920. Its totient is φ = 64365116.

The previous prime is 128730233. The next prime is 128730247. The reversal of 128730236 is 632037821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128730233) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16091276 + ... + 16091283.

It is an arithmetic number, because the mean of its divisors is an integer number (37546320).

Almost surely, 2^128730236 is an apocalyptic number.

It is an amenable number.

128730236 is a deficient number, since it is larger than the sum of its proper divisors (96547684).

128730236 is a wasteful number, since it uses less digits than its factorization.

128730236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32182563 (or 32182561 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 128730236 is about 11345.9347785892. The cubic root of 128730236 is about 504.9249779087.

The spelling of 128730236 in words is "one hundred twenty-eight million, seven hundred thirty thousand, two hundred thirty-six".