28078027761 has 32 divisors (see below), whose sum is σ = 44201484288. Its totient is φ = 15514456320.

The previous prime is 28078027751. The next prime is 28078027763. The reversal of 28078027761 is 16772087082.

It is a happy number.

It is not a de Polignac number, because 28078027761 - 2⁶ = 28078027697 is a prime.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 28078027761.

It is not an unprimeable number, because it can be changed into a prime (28078027763) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 818425 + ... + 852041.

It is an arithmetic number, because the mean of its divisors is an integer number (1381296384).

Almost surely, 2^28078027761 is an apocalyptic number.

28078027761 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

28078027761 is a deficient number, since it is larger than the sum of its proper divisors (16123456527).

28078027761 is a wasteful number, since it uses less digits than its factorization.

28078027761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34941.

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

The spelling of 28078027761 in words is "twenty-eight billion, seventy-eight million, twenty-seven thousand, seven hundred sixty-one".