28089443655 has 320 divisors, whose sum is σ = 66389621760. Its totient is φ = 11025248256.

The previous prime is 28089443647. The next prime is 28089443693. The reversal of 28089443655 is 55634498082.

28089443655 is a `hidden beast` number, since 2 + 80 + 89 + 4 + 436 + 55 = 666.

It is not a de Polignac number, because 28089443655 - 2³ = 28089443647 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 319 ways as a sum of consecutive naturals, for example, 67039036 + ... + 67039454.

It is an arithmetic number, because the mean of its divisors is an integer number (207467568).

Almost surely, 2^28089443655 is an apocalyptic number.

28089443655 is an abundant number, since it is smaller than the sum of its proper divisors (38300178105).

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

28089443655 is a wasteful number, since it uses less digits than its factorization.

28089443655 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580 (or 571 counting only the distinct ones).

The product of its (nonzero) digits is 8294400, while the sum is 54.

The spelling of 28089443655 in words is "twenty-eight billion, eighty-nine million, four hundred forty-three thousand, six hundred fifty-five".