28390211667 has 128 divisors (see below), whose sum is σ = 48126597120. Its totient is φ = 16441159680.

The previous prime is 28390211659. The next prime is 28390211677. The reversal of 28390211667 is 76611209382.

It is not a de Polignac number, because 28390211667 - 2³ = 28390211659 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28390211677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 46313253 + ... + 46313865.

It is an arithmetic number, because the mean of its divisors is an integer number (375989040).

Almost surely, 2^28390211667 is an apocalyptic number.

28390211667 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

28390211667 is a deficient number, since it is larger than the sum of its proper divisors (19736385453).

28390211667 is a wasteful number, since it uses less digits than its factorization.

28390211667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 810 (or 804 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The spelling of 28390211667 in words is "twenty-eight billion, three hundred ninety million, two hundred eleven thousand, six hundred sixty-seven".