28307663997 has 8 divisors (see below), whose sum is σ = 37745079456. Its totient is φ = 18871012272.

The previous prime is 28307663933. The next prime is 28307663999. The reversal of 28307663997 is 79936670382.

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

It is not a de Polignac number, because 28307663997 - 2⁶ = 28307663933 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28307663997.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28307663999) 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 7 ways as a sum of consecutive naturals, for example, 97983 + ... + 257324.

It is an arithmetic number, because the mean of its divisors is an integer number (4718134932).

Almost surely, 2^28307663997 is an apocalyptic number.

It is an amenable number.

28307663997 is a deficient number, since it is larger than the sum of its proper divisors (9437415459).

28307663997 is a wasteful number, since it uses less digits than its factorization.

28307663997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 381867.

The product of its (nonzero) digits is 20575296, while the sum is 60.

The spelling of 28307663997 in words is "twenty-eight billion, three hundred seven million, six hundred sixty-three thousand, nine hundred ninety-seven".