28697840063808 has 56 divisors (see below), whose sum is σ = 75933597423840. Its totient is φ = 9565455905280.

The previous prime is 28697840063729. The next prime is 28697840063873. The reversal of 28697840063808 is 80836004879682.

It is a happy number.

It is a super-2 number, since 2×28697840063808² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 72598 + ... + 7576341.

Almost surely, 2^{28697840063808} is an apocalyptic number.

It is an amenable number.

28697840063808 is an abundant number, since it is smaller than the sum of its proper divisors (47235757360032).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28697840063808 is a wasteful number, since it uses less digits than its factorization.

28697840063808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7668495 (or 7668485 counting only the distinct ones).

The product of its (nonzero) digits is 222953472, while the sum is 69.

The spelling of 28697840063808 in words is "twenty-eight trillion, six hundred ninety-seven billion, eight hundred forty million, sixty-three thousand, eight hundred eight".