28433378884 has 27 divisors (see below), whose sum is σ = 50651515677. Its totient is φ = 13965948528.

The previous prime is 28433378879. The next prime is 28433378887. The reversal of 28433378884 is 48887333482.

It is a happy number.

The square root of 28433378884 is 168622.

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., 1916513284 + 26516865600 = 43778^2 + 162840^2 .

It is a super-3 number, since 3×28433378884³ (a number of 32 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28433378887) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 19896682 + ... + 19898110.

Almost surely, 2^28433378884 is an apocalyptic number.

28433378884 is the 168622-nd square number.

It is an amenable number.

28433378884 is a deficient number, since it is larger than the sum of its proper divisors (22218136793).

28433378884 is an frugal number, since it uses more digits than its factorization.

28433378884 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2980 (or 1490 counting only the distinct ones).

The product of its digits is 24772608, while the sum is 58.

The spelling of 28433378884 in words is "twenty-eight billion, four hundred thirty-three million, three hundred seventy-eight thousand, eight hundred eighty-four".