765170842 has 4 divisors (see below), whose sum is σ = 1147756266. Its totient is φ = 382585420.

The previous prime is 765170839. The next prime is 765170843. The reversal of 765170842 is 248071567.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 248071567 = 61 ⋅4066747.

It can be written as a sum of positive squares in only one way, i.e., 689115001 + 76055841 = 26251^2 + 8721^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 765170795 and 765170804.

It is not an unprimeable number, because it can be changed into a prime (765170843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 191292709 + ... + 191292712.

Almost surely, 2^765170842 is an apocalyptic number.

765170842 is a deficient number, since it is larger than the sum of its proper divisors (382585424).

765170842 is a wasteful number, since it uses less digits than its factorization.

765170842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 382585423.

The product of its (nonzero) digits is 94080, while the sum is 40.

The square root of 765170842 is about 27661.7216022431. The cubic root of 765170842 is about 914.6455043300.

The spelling of 765170842 in words is "seven hundred sixty-five million, one hundred seventy thousand, eight hundred forty-two".