69696821 has 8 divisors (see below), whose sum is σ = 73873944. Its totient is φ = 65528320.

The previous prime is 69696811. The next prime is 69696833. The reversal of 69696821 is 12869696.

It can be written as a sum of positive squares in 4 ways, for example, as 32364721 + 37332100 = 5689^2 + 6110^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 69696821 - 2¹⁰ = 69695797 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (69696811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22931 + ... + 25791.

It is an arithmetic number, because the mean of its divisors is an integer number (9234243).

Almost surely, 2^69696821 is an apocalyptic number.

It is an amenable number.

69696821 is a deficient number, since it is larger than the sum of its proper divisors (4177123).

69696821 is a wasteful number, since it uses less digits than its factorization.

69696821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311.

The product of its digits is 279936, while the sum is 47.

The square root of 69696821 is about 8348.4621937217. The cubic root of 69696821 is about 411.5326750259.

The spelling of 69696821 in words is "sixty-nine million, six hundred ninety-six thousand, eight hundred twenty-one".