28338947547 has 4 divisors (see below), whose sum is σ = 37785263400. Its totient is φ = 18892631696.

The previous prime is 28338947543. The next prime is 28338947573. The reversal of 28338947547 is 74574983382.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28338947547 - 2² = 28338947543 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28338947543) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4723157922 + ... + 4723157927.

It is an arithmetic number, because the mean of its divisors is an integer number (9446315850).

Almost surely, 2^28338947547 is an apocalyptic number.

28338947547 is a deficient number, since it is larger than the sum of its proper divisors (9446315853).

28338947547 is an equidigital number, since it uses as much as digits as its factorization.

28338947547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9446315852.

The product of its digits is 40642560, while the sum is 60.

The spelling of 28338947547 in words is "twenty-eight billion, three hundred thirty-eight million, nine hundred forty-seven thousand, five hundred forty-seven".