128750900040 has 384 divisors, whose sum is σ = 519631257600. Its totient is φ = 26980231680.

The previous prime is 128750899957. The next prime is 128750900063. The reversal of 128750900040 is 40009057821.

It is a super-2 number, since 2×128750900040² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 128750899968 and 128750900004.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 1440909 + ... + 1527651.

It is an arithmetic number, because the mean of its divisors is an integer number (1353206400).

Almost surely, 2^128750900040 is an apocalyptic number.

128750900040 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 128750900040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (259815628800).

128750900040 is an abundant number, since it is smaller than the sum of its proper divisors (390880357560).

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

128750900040 is a wasteful number, since it uses less digits than its factorization.

128750900040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86817 (or 86810 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

Adding to 128750900040 its reverse (40009057821), we get a palindrome (168759957861).

The spelling of 128750900040 in words is "one hundred twenty-eight billion, seven hundred fifty million, nine hundred thousand, forty".