28890981970 has 8 divisors (see below), whose sum is σ = 52003767564. Its totient is φ = 11556392784.

The previous prime is 28890981967. The next prime is 28890981983. The reversal of 28890981970 is 7918909882.

It can be written as a sum of positive squares in 2 ways, for example, as 25656671329 + 3234310641 = 160177^2 + 56871^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28890981899 and 28890981908.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1444549089 + ... + 1444549108.

Almost surely, 2^28890981970 is an apocalyptic number.

28890981970 is a deficient number, since it is larger than the sum of its proper divisors (23112785594).

28890981970 is a wasteful number, since it uses less digits than its factorization.

28890981970 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2889098204.

The product of its (nonzero) digits is 5225472, while the sum is 61.

The spelling of 28890981970 in words is "twenty-eight billion, eight hundred ninety million, nine hundred eighty-one thousand, nine hundred seventy".