28781214782707 has 4 divisors (see below), whose sum is σ = 28810978190896. Its totient is φ = 28751451374520.

The previous prime is 28781214782659. The next prime is 28781214782753. The reversal of 28781214782707 is 70728741218782.

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 28781214782707 - 2²³ = 28781206394099 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28781214782807) 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, 14881702644 + ... + 14881704577.

It is an arithmetic number, because the mean of its divisors is an integer number (7202744547724).

Almost surely, 2^{28781214782707} is an apocalyptic number.

28781214782707 is a deficient number, since it is larger than the sum of its proper divisors (29763408189).

28781214782707 is an equidigital number, since it uses as much as digits as its factorization.

28781214782707 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29763408188.

The product of its (nonzero) digits is 39337984, while the sum is 64.

The spelling of 28781214782707 in words is "twenty-eight trillion, seven hundred eighty-one billion, two hundred fourteen million, seven hundred eighty-two thousand, seven hundred seven".