28857146320 has 40 divisors (see below), whose sum is σ = 67757169960. Its totient is φ = 11428569600.

The previous prime is 28857146273. The next prime is 28857146323. The reversal of 28857146320 is 2364175882.

It can be written as a sum of positive squares in 4 ways, for example, as 16645128256 + 12212018064 = 129016^2 + 110508^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28857146323) 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, 1777635 + ... + 1793794.

It is an arithmetic number, because the mean of its divisors is an integer number (1693929249).

Almost surely, 2^28857146320 is an apocalyptic number.

28857146320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28857146320 is an abundant number, since it is smaller than the sum of its proper divisors (38900023640).

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

28857146320 is a wasteful number, since it uses less digits than its factorization.

28857146320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3571543 (or 3571537 counting only the distinct ones).

The product of its (nonzero) digits is 645120, while the sum is 46.

The spelling of 28857146320 in words is "twenty-eight billion, eight hundred fifty-seven million, one hundred forty-six thousand, three hundred twenty".