28917021164784 has 40 divisors (see below), whose sum is σ = 74718002325120. Its totient is φ = 9636981551808.

The previous prime is 28917021164777. The next prime is 28917021164791. The reversal of 28917021164784 is 48746112071982.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (28917021164777) and next prime (28917021164791).

It is a super-2 number, since 2×28917021164784² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63066162 + ... + 63523025.

It is an arithmetic number, because the mean of its divisors is an integer number (1867950058128).

Almost surely, 2^{28917021164784} is an apocalyptic number.

28917021164784 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

28917021164784 is an abundant number, since it is smaller than the sum of its proper divisors (45800981160336).

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

28917021164784 is a wasteful number, since it uses less digits than its factorization.

28917021164784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 126593957 (or 126593951 counting only the distinct ones).

The product of its (nonzero) digits is 10838016, while the sum is 60.

The spelling of 28917021164784 in words is "twenty-eight trillion, nine hundred seventeen billion, twenty-one million, one hundred sixty-four thousand, seven hundred eighty-four".