28215154487 has 4 divisors (see below), whose sum is σ = 30385551000. Its totient is φ = 26044757976.

The previous prime is 28215154483. The next prime is 28215154493. The reversal of 28215154487 is 78445151282.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28215154487 - 2² = 28215154483 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28215154483) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085198237 + ... + 1085198262.

It is an arithmetic number, because the mean of its divisors is an integer number (7596387750).

Almost surely, 2^28215154487 is an apocalyptic number.

28215154487 is a deficient number, since it is larger than the sum of its proper divisors (2170396513).

28215154487 is a wasteful number, since it uses less digits than its factorization.

28215154487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2170396512.

The product of its digits is 716800, while the sum is 47.

The spelling of 28215154487 in words is "twenty-eight billion, two hundred fifteen million, one hundred fifty-four thousand, four hundred eighty-seven".