28391336436 has 48 divisors (see below), whose sum is σ = 70597545984. Its totient is φ = 8859703776.

The previous prime is 28391336419. The next prime is 28391336513. The reversal of 28391336436 is 63463319382.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1081360 + ... + 1107303.

It is an arithmetic number, because the mean of its divisors is an integer number (1470782208).

Almost surely, 2^28391336436 is an apocalyptic number.

It is an amenable number.

28391336436 is an abundant number, since it is smaller than the sum of its proper divisors (42206209548).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28391336436 is a wasteful number, since it uses less digits than its factorization.

28391336436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188740 (or 2188738 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 48.

The spelling of 28391336436 in words is "twenty-eight billion, three hundred ninety-one million, three hundred thirty-six thousand, four hundred thirty-six".