28538237540 has 12 divisors (see below), whose sum is σ = 59930298876. Its totient is φ = 11415295008.

The previous prime is 28538237531. The next prime is 28538237573. The reversal of 28538237540 is 4573283582.

It can be written as a sum of positive squares in 2 ways, for example, as 8386163776 + 20152073764 = 91576^2 + 141958^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 713455919 + ... + 713455958.

It is an arithmetic number, because the mean of its divisors is an integer number (4994191573).

Almost surely, 2^28538237540 is an apocalyptic number.

28538237540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28538237540 is an abundant number, since it is smaller than the sum of its proper divisors (31392061336).

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

28538237540 is a wasteful number, since it uses less digits than its factorization.

28538237540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426911886 (or 1426911884 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 47.

The spelling of 28538237540 in words is "twenty-eight billion, five hundred thirty-eight million, two hundred thirty-seven thousand, five hundred forty".