28488655881 has 36 divisors (see below), whose sum is σ = 48835293312. Its totient is φ = 16279205688.

The previous prime is 28488655861. The next prime is 28488655889. The reversal of 28488655881 is 18855688482.

28488655881 is a `hidden beast` number, since 2 + 8 + 48 + 8 + 6 + 5 + 588 + 1 = 666.

It is not a de Polignac number, because 28488655881 - 2²³ = 28480267273 is a prime.

It is a super-2 number, since 2×28488655881² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (28488655889) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 264225 + ... + 356078.

Almost surely, 2^28488655881 is an apocalyptic number.

28488655881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28488655881 is a deficient number, since it is larger than the sum of its proper divisors (20346637431).

28488655881 is an frugal number, since it uses more digits than its factorization.

28488655881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620334 (or 620313 counting only the distinct ones).

The product of its digits is 39321600, while the sum is 63.

The spelling of 28488655881 in words is "twenty-eight billion, four hundred eighty-eight million, six hundred fifty-five thousand, eight hundred eighty-one".