28700971537 has 6 divisors (see below), whose sum is σ = 33386844498. Its totient is φ = 24600832704.

The previous prime is 28700971529. The next prime is 28700971547. The reversal of 28700971537 is 73517900782.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 24689522641 + 4011448896 = 157129^2 + 63336^2 .

It is not a de Polignac number, because 28700971537 - 2³ = 28700971529 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 585734113 = 28700971537 / (2 + 8 + 7 + 0 + 0 + 9 + 7 + 1 + 5 + 3 + 7).

It is not an unprimeable number, because it can be changed into a prime (28700971547) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 292867008 + ... + 292867105.

It is an arithmetic number, because the mean of its divisors is an integer number (5564474083).

Almost surely, 2^28700971537 is an apocalyptic number.

It is an amenable number.

28700971537 is a deficient number, since it is larger than the sum of its proper divisors (4685872961).

28700971537 is an equidigital number, since it uses as much as digits as its factorization.

28700971537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 585734127 (or 585734120 counting only the distinct ones).

The product of its (nonzero) digits is 740880, while the sum is 49.

The spelling of 28700971537 in words is "twenty-eight billion, seven hundred million, nine hundred seventy-one thousand, five hundred thirty-seven".