128474720185 has 48 divisors (see below), whose sum is σ = 187760462400. Its totient is φ = 84033930624.

The previous prime is 128474720183. The next prime is 128474720197. The reversal of 128474720185 is 581027474821.

It is a happy number.

It is not a de Polignac number, because 128474720185 - 2¹ = 128474720183 is a prime.

It is a super-2 number, since 2×128474720185² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is not an unprimeable number, because it can be changed into a prime (128474720183) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 480786 + ... + 698644.

It is an arithmetic number, because the mean of its divisors is an integer number (3911676300).

Almost surely, 2^128474720185 is an apocalyptic number.

It is an amenable number.

128474720185 is a deficient number, since it is larger than the sum of its proper divisors (59285742215).

128474720185 is a wasteful number, since it uses less digits than its factorization.

128474720185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 217990 (or 217983 counting only the distinct ones).

The product of its (nonzero) digits is 1003520, while the sum is 49.

The spelling of 128474720185 in words is "one hundred twenty-eight billion, four hundred seventy-four million, seven hundred twenty thousand, one hundred eighty-five".