28638407020 has 48 divisors (see below), whose sum is σ = 63453196800. Its totient is φ = 10827207360.

The previous prime is 28638407003. The next prime is 28638407029. The reversal of 28638407020 is 2070483682.

It is not an unprimeable number, because it can be changed into a prime (28638407029) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 76351 + ... + 251209.

It is an arithmetic number, because the mean of its divisors is an integer number (1321941600).

Almost surely, 2^28638407020 is an apocalyptic number.

28638407020 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28638407020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31726598400).

28638407020 is an abundant number, since it is smaller than the sum of its proper divisors (34814789780).

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

28638407020 is a wasteful number, since it uses less digits than its factorization.

28638407020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175318 (or 175316 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 40.

The spelling of 28638407020 in words is "twenty-eight billion, six hundred thirty-eight million, four hundred seven thousand, twenty".