28028970890 has 8 divisors (see below), whose sum is σ = 50452147620. Its totient is φ = 11211588352.

The previous prime is 28028970799. The next prime is 28028970899. The reversal of 28028970890 is 9807982082.

It can be written as a sum of positive squares in 2 ways, for example, as 26609113129 + 1419857761 = 163123^2 + 37681^2 .

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28028970899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1401448535 + ... + 1401448554.

Almost surely, 2^28028970890 is an apocalyptic number.

28028970890 is a deficient number, since it is larger than the sum of its proper divisors (22423176730).

28028970890 is a wasteful number, since it uses less digits than its factorization.

28028970890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2802897096.

The product of its (nonzero) digits is 1161216, while the sum is 53.

The spelling of 28028970890 in words is "twenty-eight billion, twenty-eight million, nine hundred seventy thousand, eight hundred ninety".