28719936215 has 4 divisors (see below), whose sum is σ = 34463923464. Its totient is φ = 22975948968.

The previous prime is 28719936211. The next prime is 28719936251. The reversal of 28719936215 is 51263991782.

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 28719936215 - 2² = 28719936211 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 (28719936211) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2871993617 + ... + 2871993626.

It is an arithmetic number, because the mean of its divisors is an integer number (8615980866).

Almost surely, 2^28719936215 is an apocalyptic number.

28719936215 is a deficient number, since it is larger than the sum of its proper divisors (5743987249).

28719936215 is an equidigital number, since it uses as much as digits as its factorization.

28719936215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5743987248.

The product of its digits is 1632960, while the sum is 53.

The spelling of 28719936215 in words is "twenty-eight billion, seven hundred nineteen million, nine hundred thirty-six thousand, two hundred fifteen".