128890012840 has 16 divisors (see below), whose sum is σ = 290002528980. Its totient is φ = 51556005120.

The previous prime is 128890012763. The next prime is 128890012847. The reversal of 128890012840 is 48210098821.

It can be written as a sum of positive squares in 2 ways, for example, as 128019408804 + 870604036 = 357798^2 + 29506^2 .

It is a super-2 number, since 2×128890012840² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128890012847) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1611125121 + ... + 1611125200.

Almost surely, 2^128890012840 is an apocalyptic number.

128890012840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128890012840 is an abundant number, since it is smaller than the sum of its proper divisors (161112516140).

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

128890012840 is a wasteful number, since it uses less digits than its factorization.

128890012840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3222250332 (or 3222250328 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 43.

The spelling of 128890012840 in words is "one hundred twenty-eight billion, eight hundred ninety million, twelve thousand, eight hundred forty".