28061277807 has 4 divisors (see below), whose sum is σ = 37415037080. Its totient is φ = 18707518536.

The previous prime is 28061277793. The next prime is 28061277809. The reversal of 28061277807 is 70877216082.

It is a happy number.

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

It is not a de Polignac number, because 28061277807 - 2⁴ = 28061277791 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 (28061277809) 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, 4676879632 + ... + 4676879637.

It is an arithmetic number, because the mean of its divisors is an integer number (9353759270).

Almost surely, 2^28061277807 is an apocalyptic number.

28061277807 is a deficient number, since it is larger than the sum of its proper divisors (9353759273).

28061277807 is an equidigital number, since it uses as much as digits as its factorization.

28061277807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9353759272.

The product of its (nonzero) digits is 526848, while the sum is 48.

The spelling of 28061277807 in words is "twenty-eight billion, sixty-one million, two hundred seventy-seven thousand, eight hundred seven".