128250000 has 280 divisors, whose sum is σ = 484368800. Its totient is φ = 32400000.

The previous prime is 128249987. The next prime is 128250013. The reversal of 128250000 is 52821.

It is an interprime number because it is at equal distance from previous prime (128249987) and next prime (128250013).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 6749991 + ... + 6750009.

Almost surely, 2^128250000 is an apocalyptic number.

128250000 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 128250000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (242184400).

128250000 is an abundant number, since it is smaller than the sum of its proper divisors (356118800).

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

128250000 is an frugal number, since it uses more digits than its factorization.

128250000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66 (or 29 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 18.

The square root of 128250000 is about 11324.7516529061. The cubic root of 128250000 is about 504.2963110198.

The spelling of 128250000 in words is "one hundred twenty-eight million, two hundred fifty thousand".