28131611808 has 48 divisors (see below), whose sum is σ = 74780254080. Its totient is φ = 9258502656.

The previous prime is 28131611803. The next prime is 28131611813. The reversal of 28131611808 is 80811613182.

It is an interprime number because it is at equal distance from previous prime (28131611803) and next prime (28131611813).

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (28131611803) 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, 1847085 + ... + 1862252.

It is an arithmetic number, because the mean of its divisors is an integer number (1557921960).

Almost surely, 2^28131611808 is an apocalyptic number.

It is an amenable number.

28131611808 is an abundant number, since it is smaller than the sum of its proper divisors (46648642272).

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

28131611808 is a wasteful number, since it uses less digits than its factorization.

28131611808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3709429 (or 3709421 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 39.

The spelling of 28131611808 in words is "twenty-eight billion, one hundred thirty-one million, six hundred eleven thousand, eight hundred eight".