28555147831 has 12 divisors (see below), whose sum is σ = 34288737600. Its totient is φ = 23686296480.

The previous prime is 28555147811. The next prime is 28555147853. The reversal of 28555147831 is 13874155582.

It is not a de Polignac number, because 28555147831 - 2¹⁷ = 28555016759 is a prime.

It is a super-2 number, since 2×28555147831² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28555147811) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9397806 + ... + 9400843.

It is an arithmetic number, because the mean of its divisors is an integer number (2857394800).

Almost surely, 2^28555147831 is an apocalyptic number.

28555147831 is a deficient number, since it is larger than the sum of its proper divisors (5733589769).

28555147831 is a wasteful number, since it uses less digits than its factorization.

28555147831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18798694 (or 18798687 counting only the distinct ones).

The product of its digits is 1344000, while the sum is 49.

The spelling of 28555147831 in words is "twenty-eight billion, five hundred fifty-five million, one hundred forty-seven thousand, eight hundred thirty-one".