791506642 has 4 divisors (see below), whose sum is σ = 1187259966. Its totient is φ = 395753320.

The previous prime is 791506607. The next prime is 791506643. The reversal of 791506642 is 246605197.

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., 669205161 + 122301481 = 25869^2 + 11059^2 .

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 = 791506595 and 791506604.

It is not an unprimeable number, because it can be changed into a prime (791506643) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 197876659 + ... + 197876662.

Almost surely, 2^791506642 is an apocalyptic number.

791506642 is a deficient number, since it is larger than the sum of its proper divisors (395753324).

791506642 is a wasteful number, since it uses less digits than its factorization.

791506642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 395753323.

The product of its (nonzero) digits is 90720, while the sum is 40.

The square root of 791506642 is about 28133.7278368865. The cubic root of 791506642 is about 925.0208486170.

The spelling of 791506642 in words is "seven hundred ninety-one million, five hundred six thousand, six hundred forty-two".