28151217215 has 8 divisors (see below), whose sum is σ = 36852502608. Its totient is φ = 20473612480.

The previous prime is 28151217163. The next prime is 28151217217. The reversal of 28151217215 is 51271215182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28151217215 - 2⁶ = 28151217151 is a prime.

It is a super-2 number, since 2×28151217215² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28151217217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 255920102 + ... + 255920211.

It is an arithmetic number, because the mean of its divisors is an integer number (4606562826).

Almost surely, 2^28151217215 is an apocalyptic number.

28151217215 is a deficient number, since it is larger than the sum of its proper divisors (8701285393).

28151217215 is a wasteful number, since it uses less digits than its factorization.

28151217215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511840329.

The product of its digits is 11200, while the sum is 35.

The spelling of 28151217215 in words is "twenty-eight billion, one hundred fifty-one million, two hundred seventeen thousand, two hundred fifteen".