128978436 has 12 divisors (see below), whose sum is σ = 300949712. Its totient is φ = 42992808.

The previous prime is 128978429. The next prime is 128978471. The reversal of 128978436 is 634879821.

It is a tau number, because it is divible by the number of its divisors (12).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5374090 + ... + 5374113.

Almost surely, 2^128978436 is an apocalyptic number.

It is an amenable number.

128978436 is an abundant number, since it is smaller than the sum of its proper divisors (171971276).

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

128978436 is a wasteful number, since it uses less digits than its factorization.

128978436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10748210 (or 10748208 counting only the distinct ones).

The product of its digits is 580608, while the sum is 48.

The square root of 128978436 is about 11356.8673497580. The cubic root of 128978436 is about 505.2492786232.

The spelling of 128978436 in words is "one hundred twenty-eight million, nine hundred seventy-eight thousand, four hundred thirty-six".