1028509304638 has 48 divisors (see below), whose sum is σ = 1612808305920. Its totient is φ = 491822469216.

The previous prime is 1028509304629. The next prime is 1028509304681. The reversal of 1028509304638 is 8364039058201.

It is a super-2 number, since 2×1028509304638² (a number of 25 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1028509304591 and 1028509304600.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 49090081 + ... + 49111027.

It is an arithmetic number, because the mean of its divisors is an integer number (33600173040).

Almost surely, 2^{1028509304638} is an apocalyptic number.

1028509304638 is a deficient number, since it is larger than the sum of its proper divisors (584299001282).

1028509304638 is a wasteful number, since it uses less digits than its factorization.

1028509304638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21329 (or 21292 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 49.

The spelling of 1028509304638 in words is "one trillion, twenty-eight billion, five hundred nine million, three hundred four thousand, six hundred thirty-eight".