810478642 has 4 divisors (see below), whose sum is σ = 1215717966. Its totient is φ = 405239320.

The previous prime is 810478639. The next prime is 810478651. The reversal of 810478642 is 246874018.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 799249441 + 11229201 = 28271^2 + 3351^2 .

It is a junction number, because it is equal to n+sod(n) for n = 810478595 and 810478604.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 202619659 + ... + 202619662.

Almost surely, 2^810478642 is an apocalyptic number.

810478642 is a deficient number, since it is larger than the sum of its proper divisors (405239324).

810478642 is a wasteful number, since it uses less digits than its factorization.

810478642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 405239323.

The product of its (nonzero) digits is 86016, while the sum is 40.

The square root of 810478642 is about 28468.9065824453. The cubic root of 810478642 is about 932.3533269874.

The spelling of 810478642 in words is "eight hundred ten million, four hundred seventy-eight thousand, six hundred forty-two".