28143043656 has 128 divisors (see below), whose sum is σ = 91151692800. Its totient is φ = 7031681280.

The previous prime is 28143043633. The next prime is 28143043667. The reversal of 28143043656 is 65634034182.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 297610 + ... + 380601.

It is an arithmetic number, because the mean of its divisors is an integer number (712122600).

Almost surely, 2^28143043656 is an apocalyptic number.

28143043656 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

28143043656 is an abundant number, since it is smaller than the sum of its proper divisors (63008649144).

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

28143043656 is a wasteful number, since it uses less digits than its factorization.

28143043656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 678259 (or 678255 counting only the distinct ones).

The product of its (nonzero) digits is 414720, while the sum is 42.

The spelling of 28143043656 in words is "twenty-eight billion, one hundred forty-three million, forty-three thousand, six hundred fifty-six".