28766538549 has 24 divisors (see below), whose sum is σ = 47493755712. Its totient is φ = 16435897920.

The previous prime is 28766538547. The next prime is 28766538551. The reversal of 28766538549 is 94583566782.

It is a happy number.

28766538549 is a `hidden beast` number, since 2 + 87 + 6 + 6 + 5 + 3 + 8 + 549 = 666.

It is an interprime number because it is at equal distance from previous prime (28766538547) and next prime (28766538551).

It is not a de Polignac number, because 28766538549 - 2¹ = 28766538547 is a prime.

It is a super-2 number, since 2×28766538549² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28766538547) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 552222 + ... + 602064.

It is an arithmetic number, because the mean of its divisors is an integer number (1978906488).

Almost surely, 2^28766538549 is an apocalyptic number.

It is an amenable number.

28766538549 is a deficient number, since it is larger than the sum of its proper divisors (18727217163).

28766538549 is a wasteful number, since it uses less digits than its factorization.

28766538549 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59017 (or 59014 counting only the distinct ones).

The product of its digits is 87091200, while the sum is 63.

The spelling of 28766538549 in words is "twenty-eight billion, seven hundred sixty-six million, five hundred thirty-eight thousand, five hundred forty-nine".