128774499840 has 800 divisors, whose sum is σ = 534267233280. Its totient is φ = 29035708416.

The previous prime is 128774499839. The next prime is 128774499869. The reversal of 128774499840 is 48994477821.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 114669519 + ... + 114670641.

Almost surely, 2^128774499840 is an apocalyptic number.

128774499840 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 128774499840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (267133616640).

128774499840 is an abundant number, since it is smaller than the sum of its proper divisors (405492733440).

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

128774499840 is an equidigital number, since it uses as much as digits as its factorization.

128774499840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1244 (or 1219 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 128774499840 in words is "one hundred twenty-eight billion, seven hundred seventy-four million, four hundred ninety-nine thousand, eight hundred forty".