28378097764 has 9 divisors (see below), whose sum is σ = 49662260697. Its totient is φ = 14188880424.

The previous prime is 28378097689. The next prime is 28378097801. The reversal of 28378097764 is 46779087382.

The square root of 28378097764 is 168458.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 1861232164 + 26516865600 = 43142^2 + 162840^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 294802 + ... + 379030.

Almost surely, 2^28378097764 is an apocalyptic number.

28378097764 is the 168458-th square number.

It is an amenable number.

28378097764 is a deficient number, since it is larger than the sum of its proper divisors (21284162933).

28378097764 is an frugal number, since it uses more digits than its factorization.

28378097764 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 168462 (or 84231 counting only the distinct ones).

The product of its (nonzero) digits is 28449792, while the sum is 61.

The spelling of 28378097764 in words is "twenty-eight billion, three hundred seventy-eight million, ninety-seven thousand, seven hundred sixty-four".