28657537481 has 8 divisors (see below), whose sum is σ = 29024497920. Its totient is φ = 28290682368.

The previous prime is 28657537451. The next prime is 28657537537. The reversal of 28657537481 is 18473575682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28657537481 - 2²² = 28653343177 is a prime.

It is a super-2 number, since 2×28657537481² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28657537451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 622985 + ... + 667401.

It is an arithmetic number, because the mean of its divisors is an integer number (3628062240).

Almost surely, 2^28657537481 is an apocalyptic number.

It is an amenable number.

28657537481 is a deficient number, since it is larger than the sum of its proper divisors (366960439).

28657537481 is an equidigital number, since it uses as much as digits as its factorization.

28657537481 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52663.

The product of its digits is 11289600, while the sum is 56.

The spelling of 28657537481 in words is "twenty-eight billion, six hundred fifty-seven million, five hundred thirty-seven thousand, four hundred eighty-one".