128428051 has 4 divisors (see below), whose sum is σ = 129606400. Its totient is φ = 127249704.

The previous prime is 128428019. The next prime is 128428093. The reversal of 128428051 is 150824821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128428051 - 2⁵ = 128428019 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128428151) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589011 + ... + 589228.

It is an arithmetic number, because the mean of its divisors is an integer number (32401600).

Almost surely, 2^128428051 is an apocalyptic number.

128428051 is a deficient number, since it is larger than the sum of its proper divisors (1178349).

128428051 is a wasteful number, since it uses less digits than its factorization.

128428051 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1178348.

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 128428051 is about 11332.6100700589. The cubic root of 128428051 is about 504.5295766264.

The spelling of 128428051 in words is "one hundred twenty-eight million, four hundred twenty-eight thousand, fifty-one".