128492500 has 60 divisors (see below), whose sum is σ = 284284000. Its totient is φ = 50796000.

The previous prime is 128492491. The next prime is 128492519. The reversal of 128492500 is 5294821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 257251 + ... + 257749.

Almost surely, 2^128492500 is an apocalyptic number.

128492500 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 128492500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (142142000).

128492500 is an abundant number, since it is smaller than the sum of its proper divisors (155791500).

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

128492500 is a wasteful number, since it uses less digits than its factorization.

128492500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 626 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 31.

The square root of 128492500 is about 11335.4532331089. The cubic root of 128492500 is about 504.6139584747.

The spelling of 128492500 in words is "one hundred twenty-eight million, four hundred ninety-two thousand, five hundred".