28788639407 has 8 divisors (see below), whose sum is σ = 31424315472. Its totient is φ = 26156051200.

The previous prime is 28788639401. The next prime is 28788639461. The reversal of 28788639407 is 70493688782.

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 28788639407 - 2⁶ = 28788639343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28788639407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28788639401) 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, 752444 + ... + 789777.

It is an arithmetic number, because the mean of its divisors is an integer number (3928039434).

Almost surely, 2^28788639407 is an apocalyptic number.

28788639407 is a deficient number, since it is larger than the sum of its proper divisors (2635676065).

28788639407 is a wasteful number, since it uses less digits than its factorization.

28788639407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1543929.

The product of its (nonzero) digits is 32514048, while the sum is 62.

The spelling of 28788639407 in words is "twenty-eight billion, seven hundred eighty-eight million, six hundred thirty-nine thousand, four hundred seven".