28696321428 has 48 divisors (see below), whose sum is σ = 69246266880. Its totient is φ = 9239702400.

The previous prime is 28696321417. The next prime is 28696321463. The reversal of 28696321428 is 82412369682.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 129958 + ... + 272546.

It is an arithmetic number, because the mean of its divisors is an integer number (1442630560).

Almost surely, 2^28696321428 is an apocalyptic number.

It is an amenable number.

28696321428 is an abundant number, since it is smaller than the sum of its proper divisors (40549945452).

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

28696321428 is a wasteful number, since it uses less digits than its factorization.

28696321428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143168 (or 143166 counting only the distinct ones).

The product of its digits is 1990656, while the sum is 51.

The spelling of 28696321428 in words is "twenty-eight billion, six hundred ninety-six million, three hundred twenty-one thousand, four hundred twenty-eight".