742820649 has 8 divisors (see below), whose sum is σ = 990984672. Its totient is φ = 494935200.

The previous prime is 742820641. The next prime is 742820681. The reversal of 742820649 is 946028247.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 742820649 - 2³ = 742820641 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 742820649.

It is not an unprimeable number, because it can be changed into a prime (742820641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63339 + ... + 74144.

It is an arithmetic number, because the mean of its divisors is an integer number (123873084).

Almost surely, 2^742820649 is an apocalyptic number.

It is an amenable number.

742820649 is a deficient number, since it is larger than the sum of its proper divisors (248164023).

742820649 is a wasteful number, since it uses less digits than its factorization.

742820649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 139287.

The product of its (nonzero) digits is 193536, while the sum is 42.

The square root of 742820649 is about 27254.7362672986. The cubic root of 742820649 is about 905.6519417485.

The spelling of 742820649 in words is "seven hundred forty-two million, eight hundred twenty thousand, six hundred forty-nine".