28269401288 has 32 divisors (see below), whose sum is σ = 54046477560. Its totient is φ = 13858490880.

The previous prime is 28269401287. The next prime is 28269401299. The reversal of 28269401288 is 88210496282.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 3160463524 + 25108937764 = 56218^2 + 158458^2 .

It is not an unprimeable number, because it can be changed into a prime (28269401287) 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, 60206 + ... + 245282.

Almost surely, 2^28269401288 is an apocalyptic number.

It is an amenable number.

28269401288 is a deficient number, since it is larger than the sum of its proper divisors (25777076272).

28269401288 is a wasteful number, since it uses less digits than its factorization.

28269401288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185457 (or 185453 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 50.

The spelling of 28269401288 in words is "twenty-eight billion, two hundred sixty-nine million, four hundred one thousand, two hundred eighty-eight".