28252520684838 has 64 divisors (see below), whose sum is σ = 63292757360640. Its totient is φ = 9341135395200.

The previous prime is 28252520684833. The next prime is 28252520684849. The reversal of 28252520684838 is 83848602525282.

It is a happy number.

28252520684838 is a `hidden beast` number, since 2 + 8 + 2 + 5 + 2 + 520 + 68 + 48 + 3 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28252520684833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28529358 + ... + 29503038.

It is an arithmetic number, because the mean of its divisors is an integer number (988949333760).

Almost surely, 2^{28252520684838} is an apocalyptic number.

28252520684838 is an abundant number, since it is smaller than the sum of its proper divisors (35040236675802).

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

28252520684838 is a wasteful number, since it uses less digits than its factorization.

28252520684838 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 978050 (or 978044 counting only the distinct ones).

The product of its (nonzero) digits is 117964800, while the sum is 63.

The spelling of 28252520684838 in words is "twenty-eight trillion, two hundred fifty-two billion, five hundred twenty million, six hundred eighty-four thousand, eight hundred thirty-eight".