28771101890 has 16 divisors (see below), whose sum is σ = 51794986680. Its totient is φ = 11506884480.

The previous prime is 28771101883. The next prime is 28771101911. The reversal of 28771101890 is 9810117782.

It can be written as a sum of positive squares in 4 ways, for example, as 14788748881 + 13982353009 = 121609^2 + 118247^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 115355 + ... + 266174.

Almost surely, 2^28771101890 is an apocalyptic number.

28771101890 is a deficient number, since it is larger than the sum of its proper divisors (23023884790).

28771101890 is a wasteful number, since it uses less digits than its factorization.

28771101890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389077.

The product of its (nonzero) digits is 56448, while the sum is 44.

The spelling of 28771101890 in words is "twenty-eight billion, seven hundred seventy-one million, one hundred one thousand, eight hundred ninety".