28020697749 has 12 divisors (see below), whose sum is σ = 44153826912. Its totient is φ = 16982241000.

The previous prime is 28020697721. The next prime is 28020697759. The reversal of 28020697749 is 94779602082.

28020697749 is a `hidden beast` number, since 280 + 206 + 97 + 74 + 9 = 666.

It is not a de Polignac number, because 28020697749 - 2¹⁵ = 28020664981 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28020697695 and 28020697704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28020697759) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 141518577 + ... + 141518774.

It is an arithmetic number, because the mean of its divisors is an integer number (3679485576).

Almost surely, 2^28020697749 is an apocalyptic number.

It is an amenable number.

28020697749 is a deficient number, since it is larger than the sum of its proper divisors (16133129163).

28020697749 is a wasteful number, since it uses less digits than its factorization.

28020697749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 283037368 (or 283037365 counting only the distinct ones).

The product of its (nonzero) digits is 3048192, while the sum is 54.

The spelling of 28020697749 in words is "twenty-eight billion, twenty million, six hundred ninety-seven thousand, seven hundred forty-nine".