28624783997 has 4 divisors (see below), whose sum is σ = 28646957856. Its totient is φ = 28602610140.

The previous prime is 28624783961. The next prime is 28624784011. The reversal of 28624783997 is 79938742682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79938742682 = 2 ⋅39969371341.

It is a cyclic number.

It is not a de Polignac number, because 28624783997 - 2¹² = 28624779901 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28624786997) 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 3 ways as a sum of consecutive naturals, for example, 11084993 + ... + 11087574.

It is an arithmetic number, because the mean of its divisors is an integer number (7161739464).

Almost surely, 2^28624783997 is an apocalyptic number.

It is an amenable number.

28624783997 is a deficient number, since it is larger than the sum of its proper divisors (22173859).

28624783997 is a wasteful number, since it uses less digits than its factorization.

28624783997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22173858.

The product of its digits is 73156608, while the sum is 65.

The spelling of 28624783997 in words is "twenty-eight billion, six hundred twenty-four million, seven hundred eighty-three thousand, nine hundred ninety-seven".