28781447807 has 8 divisors (see below), whose sum is σ = 33009315456. Its totient is φ = 24582638232.

The previous prime is 28781447803. The next prime is 28781447819. The reversal of 28781447807 is 70874418782.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28781447807 - 2² = 28781447803 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781447803) 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, 7262393 + ... + 7266354.

It is an arithmetic number, because the mean of its divisors is an integer number (4126164432).

Almost surely, 2^28781447807 is an apocalyptic number.

28781447807 is a deficient number, since it is larger than the sum of its proper divisors (4227867649).

28781447807 is a wasteful number, since it uses less digits than its factorization.

28781447807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14529037.

The product of its (nonzero) digits is 5619712, while the sum is 56.

The spelling of 28781447807 in words is "twenty-eight billion, seven hundred eighty-one million, four hundred forty-seven thousand, eight hundred seven".