28195987432 has 32 divisors (see below), whose sum is σ = 55987518600. Its totient is φ = 13266284544.

The previous prime is 28195987397. The next prime is 28195987433. The reversal of 28195987432 is 23478959182.

It can be written as a sum of positive squares in 4 ways, for example, as 21499183876 + 6696803556 = 146626^2 + 81834^2 .

It is not an unprimeable number, because it can be changed into a prime (28195987433) 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, 891994 + ... + 923062.

Almost surely, 2^28195987432 is an apocalyptic number.

It is an amenable number.

28195987432 is a deficient number, since it is larger than the sum of its proper divisors (27791531168).

28195987432 is a wasteful number, since it uses less digits than its factorization.

28195987432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37765 (or 37761 counting only the distinct ones).

The product of its digits is 8709120, while the sum is 58.

The spelling of 28195987432 in words is "twenty-eight billion, one hundred ninety-five million, nine hundred eighty-seven thousand, four hundred thirty-two".