28557742434 has 32 divisors (see below), whose sum is σ = 65127162240. Its totient is φ = 8270115072.

The previous prime is 28557742393. The next prime is 28557742439. The reversal of 28557742434 is 43424775582.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is not an unprimeable number, because it can be changed into a prime (28557742439) 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, 10767054 + ... + 10769705.

It is an arithmetic number, because the mean of its divisors is an integer number (2035223820).

Almost surely, 2^28557742434 is an apocalyptic number.

28557742434 is an abundant number, since it is smaller than the sum of its proper divisors (36569419806).

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

28557742434 is a wasteful number, since it uses less digits than its factorization.

28557742434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21536794.

The product of its digits is 7526400, while the sum is 51.

The spelling of 28557742434 in words is "twenty-eight billion, five hundred fifty-seven million, seven hundred forty-two thousand, four hundred thirty-four".