28788210015 has 64 divisors (see below), whose sum is σ = 48517456896. Its totient is φ = 14548165632.

The previous prime is 28788210007. The next prime is 28788210049. The reversal of 28788210015 is 51001288782.

It is not a de Polignac number, because 28788210015 - 2³ = 28788210007 is a prime.

It is a super-2 number, since 2×28788210015² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 24752824 + ... + 24753986.

It is an arithmetic number, because the mean of its divisors is an integer number (758085264).

Almost surely, 2^28788210015 is an apocalyptic number.

28788210015 is a deficient number, since it is larger than the sum of its proper divisors (19729246881).

28788210015 is a wasteful number, since it uses less digits than its factorization.

28788210015 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1808.

The product of its (nonzero) digits is 71680, while the sum is 42.

Adding to 28788210015 its reverse (51001288782), we get a palindrome (79789498797).

The spelling of 28788210015 in words is "twenty-eight billion, seven hundred eighty-eight million, two hundred ten thousand, fifteen".