28452378640 has 40 divisors (see below), whose sum is σ = 75602036160. Its totient is φ = 9755101056.

The previous prime is 28452378637. The next prime is 28452378679. The reversal of 28452378640 is 4687325482.

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25403350 + ... + 25404469.

It is an arithmetic number, because the mean of its divisors is an integer number (1890050904).

Almost surely, 2^28452378640 is an apocalyptic number.

28452378640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28452378640 is an abundant number, since it is smaller than the sum of its proper divisors (47149657520).

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

28452378640 is a wasteful number, since it uses less digits than its factorization.

28452378640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50807839 (or 50807833 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 49.

The spelling of 28452378640 in words is "twenty-eight billion, four hundred fifty-two million, three hundred seventy-eight thousand, six hundred forty".