28205618437864 has 16 divisors (see below), whose sum is σ = 60440610938400. Its totient is φ = 12088122187632.

The previous prime is 28205618437859. The next prime is 28205618437883. The reversal of 28205618437864 is 46873481650282.

It is a super-2 number, since 2×28205618437864² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28205618437796 and 28205618437805.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 251835878854 + ... + 251835878965.

It is an arithmetic number, because the mean of its divisors is an integer number (3777538183650).

Almost surely, 2^{28205618437864} is an apocalyptic number.

It is an amenable number.

28205618437864 is an abundant number, since it is smaller than the sum of its proper divisors (32234992500536).

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

28205618437864 is a wasteful number, since it uses less digits than its factorization.

28205618437864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 503671757832 (or 503671757828 counting only the distinct ones).

The product of its (nonzero) digits is 123863040, while the sum is 64.

The spelling of 28205618437864 in words is "twenty-eight trillion, two hundred five billion, six hundred eighteen million, four hundred thirty-seven thousand, eight hundred sixty-four".