772819921 has 4 divisors (see below), whose sum is σ = 772954992. Its totient is φ = 772684852.

The previous prime is 772819913. The next prime is 772819933. The reversal of 772819921 is 129918277.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 772819921 - 2³ = 772819913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (772819961) 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 3 ways as a sum of consecutive naturals, for example, 58555 + ... + 70528.

It is an arithmetic number, because the mean of its divisors is an integer number (193238748).

Almost surely, 2^772819921 is an apocalyptic number.

It is an amenable number.

772819921 is a deficient number, since it is larger than the sum of its proper divisors (135071).

772819921 is a wasteful number, since it uses less digits than its factorization.

772819921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135070.

The product of its digits is 127008, while the sum is 46.

The square root of 772819921 is about 27799.6388645608. The cubic root of 772819921 is about 917.6831752709.

The spelling of 772819921 in words is "seven hundred seventy-two million, eight hundred nineteen thousand, nine hundred twenty-one".