815495642 has 16 divisors (see below), whose sum is σ = 1325141160. Its totient is φ = 376380576.

The previous prime is 815495621. The next prime is 815495647. The reversal of 815495642 is 246594518.

It can be written as a sum of positive squares in 4 ways, for example, as 450241 + 815045401 = 671^2 + 28549^2 .

It is a junction number, because it is equal to n+sod(n) for n = 815495593 and 815495602.

It is not an unprimeable number, because it can be changed into a prime (815495647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88403 + ... + 97190.

Almost surely, 2^815495642 is an apocalyptic number.

815495642 is a deficient number, since it is larger than the sum of its proper divisors (509645518).

815495642 is a wasteful number, since it uses less digits than its factorization.

815495642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 185634 (or 185608 counting only the distinct ones).

The product of its digits is 345600, while the sum is 44.

The square root of 815495642 is about 28556.8843188468. The cubic root of 815495642 is about 934.2731793270.

The spelling of 815495642 in words is "eight hundred fifteen million, four hundred ninety-five thousand, six hundred forty-two".