28131355576812 has 48 divisors (see below), whose sum is σ = 67945792692960. Its totient is φ = 9048100196352.

The previous prime is 28131355576777. The next prime is 28131355576817. The reversal of 28131355576812 is 21867555313182.

It is a super-2 number, since 2×28131355576812² (a number of 28 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28131355576817) 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, 24753333 + ... + 25864844.

It is an arithmetic number, because the mean of its divisors is an integer number (1415537347770).

Almost surely, 2^{28131355576812} is an apocalyptic number.

It is an amenable number.

28131355576812 is an abundant number, since it is smaller than the sum of its proper divisors (39814437116148).

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

28131355576812 is a wasteful number, since it uses less digits than its factorization.

28131355576812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50619810 (or 50619808 counting only the distinct ones).

The product of its digits is 12096000, while the sum is 57.

The spelling of 28131355576812 in words is "twenty-eight trillion, one hundred thirty-one billion, three hundred fifty-five million, five hundred seventy-six thousand, eight hundred twelve".