821696745 has 16 divisors (see below), whose sum is σ = 1315222272. Its totient is φ = 438069120.

The previous prime is 821696669. The next prime is 821696753. The reversal of 821696745 is 547696128.

821696745 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 821696745 - 2⁹ = 821696233 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 821696694 and 821696703.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36285 + ... + 54405.

It is an arithmetic number, because the mean of its divisors is an integer number (82201392).

Almost surely, 2^821696745 is an apocalyptic number.

It is an amenable number.

821696745 is a deficient number, since it is larger than the sum of its proper divisors (493525527).

821696745 is a wasteful number, since it uses less digits than its factorization.

821696745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21152.

The product of its digits is 725760, while the sum is 48.

The square root of 821696745 is about 28665.2532694201. The cubic root of 821696745 is about 936.6353015393.

The spelling of 821696745 in words is "eight hundred twenty-one million, six hundred ninety-six thousand, seven hundred forty-five".