69875721 has 12 divisors (see below), whose sum is σ = 103659972. Its totient is φ = 45324576.

The previous prime is 69875671. The next prime is 69875753. The reversal of 69875721 is 12757896.

It can be written as a sum of positive squares in 2 ways, for example, as 63824121 + 6051600 = 7989^2 + 2460^2 .

It is not a de Polignac number, because 69875721 - 2⁶ = 69875657 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 (69876721) 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, 104586 + ... + 105251.

It is an arithmetic number, because the mean of its divisors is an integer number (8638331).

Almost surely, 2^69875721 is an apocalyptic number.

It is an amenable number.

69875721 is a deficient number, since it is larger than the sum of its proper divisors (33784251).

69875721 is a wasteful number, since it uses less digits than its factorization.

69875721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209880 (or 209877 counting only the distinct ones).

The product of its digits is 211680, while the sum is 45.

The square root of 69875721 is about 8359.1698750534. The cubic root of 69875721 is about 411.8844858708.

The spelling of 69875721 in words is "sixty-nine million, eight hundred seventy-five thousand, seven hundred twenty-one".