28720440826 has 16 divisors (see below), whose sum is σ = 53710954560. Its totient is φ = 11189782080.

The previous prime is 28720440799. The next prime is 28720440829. The reversal of 28720440826 is 62804402782.

It is not an unprimeable number, because it can be changed into a prime (28720440829) 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, 93248031 + ... + 93248338.

It is an arithmetic number, because the mean of its divisors is an integer number (3356934660).

Almost surely, 2^28720440826 is an apocalyptic number.

28720440826 is a deficient number, since it is larger than the sum of its proper divisors (24990513734).

28720440826 is a wasteful number, since it uses less digits than its factorization.

28720440826 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186496389.

The product of its (nonzero) digits is 344064, while the sum is 43.

The spelling of 28720440826 in words is "twenty-eight billion, seven hundred twenty million, four hundred forty thousand, eight hundred twenty-six".