822977642 has 4 divisors (see below), whose sum is σ = 1234466466. Its totient is φ = 411488820.

The previous prime is 822977641. The next prime is 822977699. The reversal of 822977642 is 246779228.

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., 479653801 + 343323841 = 21901^2 + 18529^2 .

It is not an unprimeable number, because it can be changed into a prime (822977641) 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 as a sum of consecutive naturals, namely, 205744409 + ... + 205744412.

Almost surely, 2^822977642 is an apocalyptic number.

822977642 is a deficient number, since it is larger than the sum of its proper divisors (411488824).

822977642 is a wasteful number, since it uses less digits than its factorization.

822977642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411488823.

The product of its digits is 677376, while the sum is 47.

The square root of 822977642 is about 28687.5868974719. The cubic root of 822977642 is about 937.1217382917.

The spelling of 822977642 in words is "eight hundred twenty-two million, nine hundred seventy-seven thousand, six hundred forty-two".