28761955957 has 30 divisors (see below), whose sum is σ = 34521142978. Its totient is φ = 23944648896.

The previous prime is 28761955939. The next prime is 28761955967. The reversal of 28761955957 is 75955916782.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 1800644356 + 26961311601 = 42434^2 + 164199^2 .

It is not a de Polignac number, because 28761955957 - 2¹⁹ = 28761431669 is a prime.

It is a super-2 number, since 2×28761955957² (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 (28761955967) 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 29 ways as a sum of consecutive naturals, for example, 50547969 + ... + 50548537.

Almost surely, 2^28761955957 is an apocalyptic number.

It is an amenable number.

28761955957 is a deficient number, since it is larger than the sum of its proper divisors (5759187021).

28761955957 is an frugal number, since it uses more digits than its factorization.

28761955957 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1203 (or 613 counting only the distinct ones).

The product of its digits is 47628000, while the sum is 64.

The spelling of 28761955957 in words is "twenty-eight billion, seven hundred sixty-one million, nine hundred fifty-five thousand, nine hundred fifty-seven".