128049990 has 16 divisors (see below), whose sum is σ = 307320048. Its totient is φ = 34146656.

The previous prime is 128049989. The next prime is 128050009. The reversal of 128049990 is 99940821.

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, 2134137 + ... + 2134196.

It is an arithmetic number, because the mean of its divisors is an integer number (19207503).

Almost surely, 2^128049990 is an apocalyptic number.

128049990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128049990 is an abundant number, since it is smaller than the sum of its proper divisors (179270058).

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

128049990 is a wasteful number, since it uses less digits than its factorization.

128049990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4268343.

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 128049990 is about 11315.9175500708. The cubic root of 128049990 is about 504.0340191827.

The spelling of 128049990 in words is "one hundred twenty-eight million, forty-nine thousand, nine hundred ninety".