128388735 has 12 divisors (see below), whose sum is σ = 222540552. Its totient is φ = 68473968.

The previous prime is 128388721. The next prime is 128388749. The reversal of 128388735 is 537883821.

It is an interprime number because it is at equal distance from previous prime (128388721) and next prime (128388749).

It is not a de Polignac number, because 128388735 - 2⁹ = 128388223 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2853083 = 128388735 / (1 + 2 + 8 + 3 + 8 + 8 + 7 + 3 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1426497 + ... + 1426586.

It is an arithmetic number, because the mean of its divisors is an integer number (18545046).

Almost surely, 2^128388735 is an apocalyptic number.

128388735 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

128388735 is a deficient number, since it is larger than the sum of its proper divisors (94151817).

128388735 is a wasteful number, since it uses less digits than its factorization.

128388735 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2853094 (or 2853091 counting only the distinct ones).

The product of its digits is 322560, while the sum is 45.

The square root of 128388735 is about 11330.8752971692. The cubic root of 128388735 is about 504.4780870720.

The spelling of 128388735 in words is "one hundred twenty-eight million, three hundred eighty-eight thousand, seven hundred thirty-five".