128840776 has 8 divisors (see below), whose sum is σ = 241576470. Its totient is φ = 64420384.

The previous prime is 128840749. The next prime is 128840801. The reversal of 128840776 is 677048821.

It can be written as a sum of positive squares in only one way, i.e., 128278276 + 562500 = 11326^2 + 750^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8052541 + ... + 8052556.

Almost surely, 2^128840776 is an apocalyptic number.

It is an amenable number.

128840776 is a deficient number, since it is larger than the sum of its proper divisors (112735694).

128840776 is a wasteful number, since it uses less digits than its factorization.

128840776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16105103 (or 16105099 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 128840776 is about 11350.8050815790. The cubic root of 128840776 is about 505.0694620656.

The spelling of 128840776 in words is "one hundred twenty-eight million, eight hundred forty thousand, seven hundred seventy-six".