128230779 has 32 divisors (see below), whose sum is σ = 188550720. Its totient is φ = 77156352.

The previous prime is 128230769. The next prime is 128230811. The reversal of 128230779 is 977032821.

It is not a de Polignac number, because 128230779 - 2⁴ = 128230763 is a prime.

It is not an unprimeable number, because it can be changed into a prime (128230769) 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, 409527 + ... + 409839.

It is an arithmetic number, because the mean of its divisors is an integer number (5892210).

Almost surely, 2^128230779 is an apocalyptic number.

128230779 is a deficient number, since it is larger than the sum of its proper divisors (60319941).

128230779 is a wasteful number, since it uses less digits than its factorization.

128230779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 639.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 128230779 is about 11323.9029932263. The cubic root of 128230779 is about 504.2711165724.

The spelling of 128230779 in words is "one hundred twenty-eight million, two hundred thirty thousand, seven hundred seventy-nine".