128739500 has 48 divisors (see below), whose sum is σ = 282810528. Its totient is φ = 51195200.

The previous prime is 128739493. The next prime is 128739509. The reversal of 128739500 is 5937821.

It is a hoax number, since the sum of its digits (35) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (128739509) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97847 + ... + 99153.

It is an arithmetic number, because the mean of its divisors is an integer number (5891886).

Almost surely, 2^128739500 is an apocalyptic number.

128739500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128739500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (141405264).

128739500 is an abundant number, since it is smaller than the sum of its proper divisors (154071028).

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

128739500 is a wasteful number, since it uses less digits than its factorization.

128739500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1523 (or 1511 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 128739500 is about 11346.3430231947. The cubic root of 128739500 is about 504.9370898335.

The spelling of 128739500 in words is "one hundred twenty-eight million, seven hundred thirty-nine thousand, five hundred".