810028442 has 4 divisors (see below), whose sum is σ = 1215042666. Its totient is φ = 405014220.

The previous prime is 810028441. The next prime is 810028451. The reversal of 810028442 is 244820018.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 244820018 = 2 ⋅122410009.

It can be written as a sum of positive squares in only one way, i.e., 699126481 + 110901961 = 26441^2 + 10531^2 .

It is a super-2 number, since 2×810028442² = 1312292153697894728, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (810028441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202507109 + ... + 202507112.

Almost surely, 2^810028442 is an apocalyptic number.

810028442 is a deficient number, since it is larger than the sum of its proper divisors (405014224).

810028442 is a wasteful number, since it uses less digits than its factorization.

810028442 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405014223.

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 810028442 is about 28460.9986121359. The cubic root of 810028442 is about 932.1806622643.

The spelling of 810028442 in words is "eight hundred ten million, twenty-eight thousand, four hundred forty-two".