28131571404 has 24 divisors (see below), whose sum is σ = 72933703920. Its totient is φ = 9377190432.

The previous prime is 28131571387. The next prime is 28131571409. The reversal of 28131571404 is 40417513182.

28131571404 is a `hidden beast` number, since 2 + 81 + 3 + 1 + 571 + 4 + 0 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28131571409) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 130238649 + ... + 130238864.

It is an arithmetic number, because the mean of its divisors is an integer number (3038904330).

Almost surely, 2^28131571404 is an apocalyptic number.

It is an amenable number.

28131571404 is an abundant number, since it is smaller than the sum of its proper divisors (44802132516).

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

28131571404 is a wasteful number, since it uses less digits than its factorization.

28131571404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260477526 (or 260477518 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The spelling of 28131571404 in words is "twenty-eight billion, one hundred thirty-one million, five hundred seventy-one thousand, four hundred four".