28107712420 has 12 divisors (see below), whose sum is σ = 59026196124. Its totient is φ = 11243084960.

The previous prime is 28107712393. The next prime is 28107712429. The reversal of 28107712420 is 2421770182.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3549061476 + 24558650944 = 59574^2 + 156712^2 .

It is not an unprimeable number, because it can be changed into a prime (28107712429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 702692791 + ... + 702692830.

It is an arithmetic number, because the mean of its divisors is an integer number (4918849677).

Almost surely, 2^28107712420 is an apocalyptic number.

28107712420 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28107712420 is an abundant number, since it is smaller than the sum of its proper divisors (30918483704).

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

28107712420 is a wasteful number, since it uses less digits than its factorization.

28107712420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1405385630 (or 1405385628 counting only the distinct ones).

The product of its (nonzero) digits is 12544, while the sum is 34.

The spelling of 28107712420 in words is "twenty-eight billion, one hundred seven million, seven hundred twelve thousand, four hundred twenty".