28551908897281 has 8 divisors (see below), whose sum is σ = 35597185118784. Its totient is φ = 22248240699120.

The previous prime is 28551908897273. The next prime is 28551908897321. The reversal of 28551908897281 is 18279880915582.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28551908897281 - 2³ = 28551908897273 is a prime.

It is a super-2 number, since 2×28551908897281² (a number of 28 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28551908897221) 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, 185402005750 + ... + 185402005903.

It is an arithmetic number, because the mean of its divisors is an integer number (4449648139848).

Almost surely, 2^{28551908897281} is an apocalyptic number.

It is an amenable number.

28551908897281 is a deficient number, since it is larger than the sum of its proper divisors (7045276221503).

28551908897281 is a wasteful number, since it uses less digits than its factorization.

28551908897281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 370804011671.

The product of its (nonzero) digits is 232243200, while the sum is 73.

The spelling of 28551908897281 in words is "twenty-eight trillion, five hundred fifty-one billion, nine hundred eight million, eight hundred ninety-seven thousand, two hundred eighty-one".