128266736 has 40 divisors (see below), whose sum is σ = 269191104. Its totient is φ = 58855680.

The previous prime is 128266729. The next prime is 128266741. The reversal of 128266736 is 637662821.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 128266693 and 128266702.

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, 35945 + ... + 39351.

Almost surely, 2^128266736 is an apocalyptic number.

128266736 is a gapful number since it is divisible by the number (16) 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 128266736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134595552).

128266736 is an abundant number, since it is smaller than the sum of its proper divisors (140924368).

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

128266736 is a wasteful number, since it uses less digits than its factorization.

128266736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3609 (or 3603 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 128266736 is about 11325.4905412525. The cubic root of 128266736 is about 504.3182461361.

The spelling of 128266736 in words is "one hundred twenty-eight million, two hundred sixty-six thousand, seven hundred thirty-six".