16128990 has 128 divisors (see below), whose sum is σ = 46448640. Its totient is φ = 3974400.

The previous prime is 16128989. The next prime is 16129067. The reversal of 16128990 is 9982161.

Added to its reverse (9982161) it gives a triangular number (26111151 = T₇₂₂₆).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 343147 + ... + 343193.

It is an arithmetic number, because the mean of its divisors is an integer number (362880).

Almost surely, 2^16128990 is an apocalyptic number.

16128990 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 16128990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23224320).

16128990 is an abundant number, since it is smaller than the sum of its proper divisors (30319650).

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

16128990 is a wasteful number, since it uses less digits than its factorization.

16128990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135 (or 129 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 36.

The square root of 16128990 is about 4016.0913834224. The cubic root of 16128990 is about 252.6595534400.

Adding to 16128990 its reverse (9982161), we get a triangular number (26111151 = T₇₂₂₆).

The spelling of 16128990 in words is "sixteen million, one hundred twenty-eight thousand, nine hundred ninety".