28630918381 has 8 divisors (see below), whose sum is σ = 31037492864. Its totient is φ = 26253514800.

The previous prime is 28630918333. The next prime is 28630918387. The reversal of 28630918381 is 18381903682.

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 28630918381 - 2⁹ = 28630917869 is a prime.

It is a super-2 number, since 2×28630918381² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28630918387) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7290681 + ... + 7294606.

It is an arithmetic number, because the mean of its divisors is an integer number (3879686608).

Almost surely, 2^28630918381 is an apocalyptic number.

It is an amenable number.

28630918381 is a deficient number, since it is larger than the sum of its proper divisors (2406574483).

28630918381 is a wasteful number, since it uses less digits than its factorization.

28630918381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14585451.

The product of its (nonzero) digits is 497664, while the sum is 49.

The spelling of 28630918381 in words is "twenty-eight billion, six hundred thirty million, nine hundred eighteen thousand, three hundred eighty-one".