28278066741 has 4 divisors (see below), whose sum is σ = 37704088992. Its totient is φ = 18852044492.

The previous prime is 28278066697. The next prime is 28278066797. The reversal of 28278066741 is 14766087282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28278066741 is a prime.

It is a super-2 number, since 2×28278066741² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28278066041) 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, 4713011121 + ... + 4713011126.

It is an arithmetic number, because the mean of its divisors is an integer number (9426022248).

Almost surely, 2^28278066741 is an apocalyptic number.

It is an amenable number.

28278066741 is a deficient number, since it is larger than the sum of its proper divisors (9426022251).

28278066741 is an equidigital number, since it uses as much as digits as its factorization.

28278066741 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426022250.

The product of its (nonzero) digits is 1806336, while the sum is 51.

The spelling of 28278066741 in words is "twenty-eight billion, two hundred seventy-eight million, sixty-six thousand, seven hundred forty-one".