815493378 has 48 divisors (see below), whose sum is σ = 1958494464. Its totient is φ = 225479520.

The previous prime is 815493377. The next prime is 815493421. The reversal of 815493378 is 873394518.

It is not an unprimeable number, because it can be changed into a prime (815493377) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35625 + ... + 53852.

It is an arithmetic number, because the mean of its divisors is an integer number (40801968).

Almost surely, 2^815493378 is an apocalyptic number.

815493378 is an abundant number, since it is smaller than the sum of its proper divisors (1143001086).

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

815493378 is a wasteful number, since it uses less digits than its factorization.

815493378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 89527 (or 89520 counting only the distinct ones).

The product of its digits is 725760, while the sum is 48.

The square root of 815493378 is about 28556.8446786405. The cubic root of 815493378 is about 934.2723147418.

The spelling of 815493378 in words is "eight hundred fifteen million, four hundred ninety-three thousand, three hundred seventy-eight".