69728669 has 2 divisors, whose sum is σ = 69728670. Its totient is φ = 69728668.

The previous prime is 69728647. The next prime is 69728677. The reversal of 69728669 is 96682796.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 51768025 + 17960644 = 7195^2 + 4238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69728669 is a prime.

It is a super-2 number, since 2×69728669² = 9724174561023122, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 69728669.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69728699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34864334 + 34864335.

It is an arithmetic number, because the mean of its divisors is an integer number (34864335).

Almost surely, 2^69728669 is an apocalyptic number.

It is an amenable number.

69728669 is a deficient number, since it is larger than the sum of its proper divisors (1).

69728669 is an equidigital number, since it uses as much as digits as its factorization.

69728669 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 69728669 is about 8350.3693930269. The cubic root of 69728669 is about 411.5953488399.

The spelling of 69728669 in words is "sixty-nine million, seven hundred twenty-eight thousand, six hundred sixty-nine".