128407740 has 24 divisors (see below), whose sum is σ = 359541840. Its totient is φ = 34242048.

The previous prime is 128407739. The next prime is 128407759. The reversal of 128407740 is 47704821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1070005 + ... + 1070124.

It is an arithmetic number, because the mean of its divisors is an integer number (14980910).

Almost surely, 2^128407740 is an apocalyptic number.

128407740 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128407740 is an abundant number, since it is smaller than the sum of its proper divisors (231134100).

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

128407740 is a wasteful number, since it uses less digits than its factorization.

128407740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2140141 (or 2140139 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 128407740 is about 11331.7139039070. The cubic root of 128407740 is about 504.5029779707.

The spelling of 128407740 in words is "one hundred twenty-eight million, four hundred seven thousand, seven hundred forty".