128432740 has 12 divisors (see below), whose sum is σ = 269708796. Its totient is φ = 51373088.

The previous prime is 128432729. The next prime is 128432767. The reversal of 128432740 is 47234821.

128432740 is digitally balanced in base 9, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 82410084 + 46022656 = 9078^2 + 6784^2 .

128432740 is strictly pandigital in base 9.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3210799 + ... + 3210838.

It is an arithmetic number, because the mean of its divisors is an integer number (22475733).

Almost surely, 2^128432740 is an apocalyptic number.

128432740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128432740 is an abundant number, since it is smaller than the sum of its proper divisors (141276056).

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

128432740 is a wasteful number, since it uses less digits than its factorization.

128432740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6421646 (or 6421644 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 31.

The square root of 128432740 is about 11332.8169490202. The cubic root of 128432740 is about 504.5357167969.

The spelling of 128432740 in words is "one hundred twenty-eight million, four hundred thirty-two thousand, seven hundred forty".