128390419856 has 20 divisors (see below), whose sum is σ = 253449957852. Its totient is φ = 62983979136.

The previous prime is 128390419847. The next prime is 128390419879. The reversal of 128390419856 is 658914093821.

It can be written as a sum of positive squares in 2 ways, for example, as 104210169856 + 24180250000 = 322816^2 + 155500^2 .

It is a super-3 number, since 3×128390419856³ (a number of 34 digits) contains 333 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 75701051 + ... + 75702746.

Almost surely, 2^128390419856 is an apocalyptic number.

128390419856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128390419856 is a deficient number, since it is larger than the sum of its proper divisors (125059537996).

128390419856 is a wasteful number, since it uses less digits than its factorization.

128390419856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151403858 (or 151403852 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 56.

The spelling of 128390419856 in words is "one hundred twenty-eight billion, three hundred ninety million, four hundred nineteen thousand, eight hundred fifty-six".