28364172420 has 96 divisors (see below), whose sum is σ = 83641783680. Its totient is φ = 7162076160.

The previous prime is 28364172407. The next prime is 28364172433. The reversal of 28364172420 is 2427146382.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28364172407) and next prime (28364172433).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2814190 + ... + 2824250.

It is an arithmetic number, because the mean of its divisors is an integer number (871268580).

Almost surely, 2^28364172420 is an apocalyptic number.

28364172420 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 28364172420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41820891840).

28364172420 is an abundant number, since it is smaller than the sum of its proper divisors (55277611260).

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

28364172420 is a wasteful number, since it uses less digits than its factorization.

28364172420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12565 (or 12563 counting only the distinct ones).

The product of its (nonzero) digits is 129024, while the sum is 39.

The spelling of 28364172420 in words is "twenty-eight billion, three hundred sixty-four million, one hundred seventy-two thousand, four hundred twenty".