128678011 has 16 divisors (see below), whose sum is σ = 163461888. Its totient is φ = 98373600.

The previous prime is 128677987. The next prime is 128678021. The reversal of 128678011 is 110876821.

It is a cyclic number.

It is not a de Polignac number, because 128678011 - 2⁹ = 128677499 is a prime.

It is a super-2 number, since 2×128678011² = 33116061029832242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128678021) 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, 11685 + ... + 19846.

It is an arithmetic number, because the mean of its divisors is an integer number (10216368).

Almost surely, 2^128678011 is an apocalyptic number.

128678011 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

128678011 is a deficient number, since it is larger than the sum of its proper divisors (34783877).

128678011 is a wasteful number, since it uses less digits than its factorization.

128678011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31602.

The product of its (nonzero) digits is 5376, while the sum is 34.

The square root of 128678011 is about 11343.6330600033. The cubic root of 128678011 is about 504.8566871052.

It can be divided in two parts, 1286 and 78011, that added together give a palindrome (79297).

The spelling of 128678011 in words is "one hundred twenty-eight million, six hundred seventy-eight thousand, eleven".