128777861460 has 96 divisors (see below), whose sum is σ = 362480912640. Its totient is φ = 34159813632.

The previous prime is 128777861437. The next prime is 128777861467. The reversal of 128777861460 is 64168777821.

It is a self number, because there is not a number n which added to its sum of digits gives 128777861460.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128777861467) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17899624 + ... + 17906816.

It is an arithmetic number, because the mean of its divisors is an integer number (3775842840).

Almost surely, 2^128777861460 is an apocalyptic number.

128777861460 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

128777861460 is an abundant number, since it is smaller than the sum of its proper divisors (233703051180).

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

128777861460 is a wasteful number, since it uses less digits than its factorization.

128777861460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8737 (or 8735 counting only the distinct ones).

The product of its (nonzero) digits is 6322176, while the sum is 57.

The spelling of 128777861460 in words is "one hundred twenty-eight billion, seven hundred seventy-seven million, eight hundred sixty-one thousand, four hundred sixty".