128301640 has 32 divisors (see below), whose sum is σ = 289023480. Its totient is φ = 51259392.

The previous prime is 128301631. The next prime is 128301647. The reversal of 128301640 is 46103821.

It can be written as a sum of positive squares in 4 ways, for example, as 118679236 + 9622404 = 10894^2 + 3102^2 .

It is a super-2 number, since 2×128301640² = 32922621653379200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128301647) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48184 + ... + 50776.

Almost surely, 2^128301640 is an apocalyptic number.

128301640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128301640 is an abundant number, since it is smaller than the sum of its proper divisors (160721840).

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

128301640 is a wasteful number, since it uses less digits than its factorization.

128301640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3841 (or 3837 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 128301640 is about 11327.0313851424. The cubic root of 128301640 is about 504.3639870875.

The spelling of 128301640 in words is "one hundred twenty-eight million, three hundred one thousand, six hundred forty".