69997997 has 4 divisors (see below), whose sum is σ = 70019136. Its totient is φ = 69976860.

The previous prime is 69997981. The next prime is 69997999. The reversal of 69997997 is 79979996.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 69997997 - 2⁴ = 69997981 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 (69997999) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4403 + ... + 12624.

It is an arithmetic number, because the mean of its divisors is an integer number (17504784).

Almost surely, 2^69997997 is an apocalyptic number.

It is an amenable number.

69997997 is a deficient number, since it is larger than the sum of its proper divisors (21139).

69997997 is a wasteful number, since it uses less digits than its factorization.

69997997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21138.

The product of its digits is 17360406, while the sum is 65.

The square root of 69997997 is about 8366.4805623392. The cubic root of 69997997 is about 412.1245990222.

The spelling of 69997997 in words is "sixty-nine million, nine hundred ninety-seven thousand, nine hundred ninety-seven".