128861205390 has 48 divisors (see below), whose sum is σ = 335166996528. Its totient is φ = 34349874048.

The previous prime is 128861205367. The next prime is 128861205437. The reversal of 128861205390 is 93502168821.

128861205390 is a `hidden beast` number, since 1 + 28 + 8 + 612 + 0 + 5 + 3 + 9 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 34924 + ... + 508863.

It is an arithmetic number, because the mean of its divisors is an integer number (6982645761).

Almost surely, 2^128861205390 is an apocalyptic number.

128861205390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

128861205390 is an abundant number, since it is smaller than the sum of its proper divisors (206305791138).

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

128861205390 is a wasteful number, since it uses less digits than its factorization.

128861205390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 546433 (or 546430 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 128861205390 in words is "one hundred twenty-eight billion, eight hundred sixty-one million, two hundred five thousand, three hundred ninety".