69729921 has 12 divisors (see below), whose sum is σ = 100793472. Its totient is φ = 46453176.

The previous prime is 69729901. The next prime is 69729929. The reversal of 69729921 is 12992796.

It is not a de Polignac number, because 69729921 - 2⁶ = 69729857 is a prime.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (69729929) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 22360 + ... + 25286.

It is an arithmetic number, because the mean of its divisors is an integer number (8399456).

Almost surely, 2^69729921 is an apocalyptic number.

It is an amenable number.

69729921 is a deficient number, since it is larger than the sum of its proper divisors (31063551).

69729921 is a wasteful number, since it uses less digits than its factorization.

69729921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5580 (or 5577 counting only the distinct ones).

The product of its digits is 122472, while the sum is 45.

The square root of 69729921 is about 8350.4443594338. Note that the first 3 decimals coincide. The cubic root of 69729921 is about 411.5978122661.

The spelling of 69729921 in words is "sixty-nine million, seven hundred twenty-nine thousand, nine hundred twenty-one".