28090341904638 has 64 divisors (see below), whose sum is σ = 64062535219200. Its totient is φ = 8134594186752.

The previous prime is 28090341904633. The next prime is 28090341904687. The reversal of 28090341904638 is 83640914309082.

It is a super-2 number, since 2×28090341904638² (a number of 28 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28090341904633) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 74863131 + ... + 75237417.

It is an arithmetic number, because the mean of its divisors is an integer number (1000977112800).

Almost surely, 2^{28090341904638} is an apocalyptic number.

28090341904638 is an abundant number, since it is smaller than the sum of its proper divisors (35972193314562).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28090341904638 is a wasteful number, since it uses less digits than its factorization.

28090341904638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430921.

The product of its (nonzero) digits is 8957952, while the sum is 57.

The spelling of 28090341904638 in words is "twenty-eight trillion, ninety billion, three hundred forty-one million, nine hundred four thousand, six hundred thirty-eight".