28781234247 has 8 divisors (see below), whose sum is σ = 39267420544. Its totient is φ = 18741268728.

The previous prime is 28781234213. The next prime is 28781234263. The reversal of 28781234247 is 74243218782.

It is a happy number.

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

It is not a de Polignac number, because 28781234247 - 2¹¹ = 28781232199 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28781234196 and 28781234205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28781234267) 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, 111555043 + ... + 111555300.

It is an arithmetic number, because the mean of its divisors is an integer number (4908427568).

Almost surely, 2^28781234247 is an apocalyptic number.

28781234247 is a deficient number, since it is larger than the sum of its proper divisors (10486186297).

28781234247 is a wasteful number, since it uses less digits than its factorization.

28781234247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 223110389.

The product of its digits is 1204224, while the sum is 48.

The spelling of 28781234247 in words is "twenty-eight billion, seven hundred eighty-one million, two hundred thirty-four thousand, two hundred forty-seven".