28718761621 has 8 divisors (see below), whose sum is σ = 31337460000. Its totient is φ = 26101380240.

The previous prime is 28718761613. The next prime is 28718761633. The reversal of 28718761621 is 12616781782.

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 28718761621 - 2³ = 28718761613 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28718761601) 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, 283371 + ... + 371128.

It is an arithmetic number, because the mean of its divisors is an integer number (3917182500).

Almost surely, 2^28718761621 is an apocalyptic number.

It is an amenable number.

28718761621 is a deficient number, since it is larger than the sum of its proper divisors (2618698379).

28718761621 is a wasteful number, since it uses less digits than its factorization.

28718761621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 658499.

The product of its digits is 451584, while the sum is 49.

The spelling of 28718761621 in words is "twenty-eight billion, seven hundred eighteen million, seven hundred sixty-one thousand, six hundred twenty-one".