28347775890 has 64 divisors (see below), whose sum is σ = 78096559104. Its totient is φ = 6450936768.

The previous prime is 28347775889. The next prime is 28347775991. The reversal of 28347775890 is 9857774382.

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, 249664 + ... + 345003.

It is an arithmetic number, because the mean of its divisors is an integer number (1220258736).

Almost surely, 2^28347775890 is an apocalyptic number.

28347775890 is an abundant number, since it is smaller than the sum of its proper divisors (49748783214).

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

28347775890 is a wasteful number, since it uses less digits than its factorization.

28347775890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594911.

The product of its (nonzero) digits is 23708160, while the sum is 60.

The spelling of 28347775890 in words is "twenty-eight billion, three hundred forty-seven million, seven hundred seventy-five thousand, eight hundred ninety".