28390501940 has 24 divisors (see below), whose sum is σ = 60147669960. Its totient is φ = 11255702528.

The previous prime is 28390501849. The next prime is 28390501957. The reversal of 28390501940 is 4910509382.

It can be written as a sum of positive squares in 4 ways, for example, as 3348705424 + 25041796516 = 57868^2 + 158246^2 .

It is a congruent number.

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, 6278825 + ... + 6283344.

It is an arithmetic number, because the mean of its divisors is an integer number (2506152915).

Almost surely, 2^28390501940 is an apocalyptic number.

28390501940 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28390501940 is an abundant number, since it is smaller than the sum of its proper divisors (31757168020).

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

28390501940 is a wasteful number, since it uses less digits than its factorization.

28390501940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12562291 (or 12562289 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 41.

The spelling of 28390501940 in words is "twenty-eight billion, three hundred ninety million, five hundred one thousand, nine hundred forty".