28630394138 has 8 divisors (see below), whose sum is σ = 42954248820. Its totient is φ = 14312311200.

The previous prime is 28630394063. The next prime is 28630394141. The reversal of 28630394138 is 83149303682.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 25997370169 + 2633023969 = 161237^2 + 51313^2 .

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

It is a junction number, because it is equal to n+sod(n) for n = 28630394092 and 28630394101.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1430513 + ... + 1450388.

Almost surely, 2^28630394138 is an apocalyptic number.

28630394138 is a deficient number, since it is larger than the sum of its proper divisors (14323854682).

28630394138 is a wasteful number, since it uses less digits than its factorization.

28630394138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2885872.

The product of its (nonzero) digits is 746496, while the sum is 47.

The spelling of 28630394138 in words is "twenty-eight billion, six hundred thirty million, three hundred ninety-four thousand, one hundred thirty-eight".