810042445 has 8 divisors (see below), whose sum is σ = 972998136. Its totient is φ = 647402496.

The previous prime is 810042439. The next prime is 810042491. The reversal of 810042445 is 544240018.

It can be written as a sum of positive squares in 4 ways, for example, as 160098409 + 649944036 = 12653^2 + 25494^2 .

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 810042445 - 2¹⁷ = 809911373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 73252 + ... + 83581.

It is an arithmetic number, because the mean of its divisors is an integer number (121624767).

Almost surely, 2^810042445 is an apocalyptic number.

It is an amenable number.

810042445 is a deficient number, since it is larger than the sum of its proper divisors (162955691).

810042445 is a wasteful number, since it uses less digits than its factorization.

810042445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157871.

The product of its (nonzero) digits is 5120, while the sum is 28.

The square root of 810042445 is about 28461.2446143875. The cubic root of 810042445 is about 932.1860337837.

The spelling of 810042445 in words is "eight hundred ten million, forty-two thousand, four hundred forty-five".