55128767428 has 24 divisors (see below), whose sum is σ = 110355257600. Its totient is φ = 23605674048.

The previous prime is 55128767401. The next prime is 55128767429. The reversal of 55128767428 is 82476782155.

It is not an unprimeable number, because it can be changed into a prime (55128767429) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 840348 + ... + 903571.

Almost surely, 2^55128767428 is an apocalyptic number.

It is an amenable number.

55128767428 is an abundant number, since it is smaller than the sum of its proper divisors (55226490172).

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

55128767428 is a wasteful number, since it uses less digits than its factorization.

55128767428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1745059 (or 1745057 counting only the distinct ones).

The product of its digits is 7526400, while the sum is 55.

The spelling of 55128767428 in words is "fifty-five billion, one hundred twenty-eight million, seven hundred sixty-seven thousand, four hundred twenty-eight".