28788203491 has 8 divisors (see below), whose sum is σ = 29212020320. Its totient is φ = 28366979328.

The previous prime is 28788203471. The next prime is 28788203513. The reversal of 28788203491 is 19430288782.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 28788203491 - 2¹³ = 28788195299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28788203471) 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, 625791 + ... + 670216.

It is an arithmetic number, because the mean of its divisors is an integer number (3651502540).

Almost surely, 2^28788203491 is an apocalyptic number.

28788203491 is a deficient number, since it is larger than the sum of its proper divisors (423816829).

28788203491 is a wasteful number, since it uses less digits than its factorization.

28788203491 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1296333.

The product of its (nonzero) digits is 1548288, while the sum is 52.

The spelling of 28788203491 in words is "twenty-eight billion, seven hundred eighty-eight million, two hundred three thousand, four hundred ninety-one".