69998879 has 2 divisors, whose sum is σ = 69998880. Its totient is φ = 69998878.

The previous prime is 69998827. The next prime is 69998881. The reversal of 69998879 is 97889996.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-69998879 is a prime.

It is a super-2 number, since 2×69998879² = 9799686122513282, which contains 22 as substring.

Together with 69998881, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (69998479) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34999439 + 34999440.

It is an arithmetic number, because the mean of its divisors is an integer number (34999440).

Almost surely, 2^69998879 is an apocalyptic number.

69998879 is a deficient number, since it is larger than the sum of its proper divisors (1).

69998879 is an equidigital number, since it uses as much as digits as its factorization.

69998879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17635968, while the sum is 65.

The square root of 69998879 is about 8366.5332725090. The cubic root of 69998879 is about 412.1263299878.

The spelling of 69998879 in words is "sixty-nine million, nine hundred ninety-eight thousand, eight hundred seventy-nine".