28216365457 has 12 divisors (see below), whose sum is σ = 33238606080. Its totient is φ = 23879307816.

The previous prime is 28216365449. The next prime is 28216365467. The reversal of 28216365457 is 75456361282.

It is not a de Polignac number, because 28216365457 - 2³ = 28216365449 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28216365457.

It is not an unprimeable number, because it can be changed into a prime (28216365407) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3640713 + ... + 3648454.

It is an arithmetic number, because the mean of its divisors is an integer number (2769883840).

Almost surely, 2^28216365457 is an apocalyptic number.

It is an amenable number.

28216365457 is a deficient number, since it is larger than the sum of its proper divisors (5022240623).

28216365457 is an equidigital number, since it uses as much as digits as its factorization.

28216365457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7289260 (or 7289253 counting only the distinct ones).

The product of its digits is 2419200, while the sum is 49.

The spelling of 28216365457 in words is "twenty-eight billion, two hundred sixteen million, three hundred sixty-five thousand, four hundred fifty-seven".