128778611 has 16 divisors (see below), whose sum is σ = 144278400. Its totient is φ = 114162048.

The previous prime is 128778583. The next prime is 128778613. The reversal of 128778611 is 116877821.

It is not a de Polignac number, because 128778611 - 2⁶ = 128778547 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128778613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36305 + ... + 39693.

It is an arithmetic number, because the mean of its divisors is an integer number (9017400).

Almost surely, 2^128778611 is an apocalyptic number.

128778611 is a deficient number, since it is larger than the sum of its proper divisors (15499789).

128778611 is a wasteful number, since it uses less digits than its factorization.

128778611 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3518.

The product of its digits is 37632, while the sum is 41.

The square root of 128778611 is about 11348.0663991713. The cubic root of 128778611 is about 504.9882178737.

The spelling of 128778611 in words is "one hundred twenty-eight million, seven hundred seventy-eight thousand, six hundred eleven".