28657604997 has 24 divisors (see below), whose sum is σ = 47354324160. Its totient is φ = 16359667200.

The previous prime is 28657604993. The next prime is 28657605013. The reversal of 28657604997 is 79940675682.

28657604997 is a `hidden beast` number, since 2 + 86 + 5 + 7 + 60 + 499 + 7 = 666.

It is not a de Polignac number, because 28657604997 - 2² = 28657604993 is a prime.

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 (28657604993) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 159004 + ... + 287397.

It is an arithmetic number, because the mean of its divisors is an integer number (1973096840).

Almost surely, 2^28657604997 is an apocalyptic number.

It is an amenable number.

28657604997 is a deficient number, since it is larger than the sum of its proper divisors (18696719163).

28657604997 is a wasteful number, since it uses less digits than its factorization.

28657604997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447433 (or 447430 counting only the distinct ones).

The product of its (nonzero) digits is 45722880, while the sum is 63.

The spelling of 28657604997 in words is "twenty-eight billion, six hundred fifty-seven million, six hundred four thousand, nine hundred ninety-seven".