775030821 has 8 divisors (see below), whose sum is σ = 1033852320. Its totient is φ = 516448272.

The previous prime is 775030807. The next prime is 775030847. The reversal of 775030821 is 128030577.

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

It is not a de Polignac number, because 775030821 - 2⁷ = 775030693 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (775030021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52026 + ... + 65243.

It is an arithmetic number, because the mean of its divisors is an integer number (129231540).

Almost surely, 2^775030821 is an apocalyptic number.

It is an amenable number.

775030821 is a deficient number, since it is larger than the sum of its proper divisors (258821499).

775030821 is a wasteful number, since it uses less digits than its factorization.

775030821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 119475.

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 775030821 is about 27839.3753701479. The cubic root of 775030821 is about 918.5574513979.

The spelling of 775030821 in words is "seven hundred seventy-five million, thirty thousand, eight hundred twenty-one".