28528550217 has 32 divisors (see below), whose sum is σ = 44507664000. Its totient is φ = 18010460160.

The previous prime is 28528550201. The next prime is 28528550279. The reversal of 28528550217 is 71205582582.

28528550217 is a `hidden beast` number, since 2 + 8 + 52 + 85 + 502 + 17 = 666.

It is not a de Polignac number, because 28528550217 - 2⁴ = 28528550201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28528550287) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1369117 + ... + 1389797.

It is an arithmetic number, because the mean of its divisors is an integer number (1390864500).

Almost surely, 2^28528550217 is an apocalyptic number.

28528550217 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

It is an amenable number.

28528550217 is a deficient number, since it is larger than the sum of its proper divisors (15979113783).

28528550217 is a wasteful number, since it uses less digits than its factorization.

28528550217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23398 (or 23392 counting only the distinct ones).

The product of its (nonzero) digits is 448000, while the sum is 45.

The spelling of 28528550217 in words is "twenty-eight billion, five hundred twenty-eight million, five hundred fifty thousand, two hundred seventeen".