128779464 has 64 divisors (see below), whose sum is σ = 352226880. Its totient is φ = 38912000.

The previous prime is 128779463. The next prime is 128779489. The reversal of 128779464 is 464977821.

It is not an unprimeable number, because it can be changed into a prime (128779463) 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, 168844 + ... + 169604.

It is an arithmetic number, because the mean of its divisors is an integer number (5503545).

Almost surely, 2^128779464 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128779464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176113440).

128779464 is an abundant number, since it is smaller than the sum of its proper divisors (223447416).

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

128779464 is a wasteful number, since it uses less digits than its factorization.

128779464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1422 (or 1418 counting only the distinct ones).

The product of its digits is 677376, while the sum is 48.

The square root of 128779464 is about 11348.1039826043. The cubic root of 128779464 is about 504.9893328466.

The spelling of 128779464 in words is "one hundred twenty-eight million, seven hundred seventy-nine thousand, four hundred sixty-four".