99689657 has 4 divisors (see below), whose sum is σ = 99793296. Its totient is φ = 99586020.

The previous prime is 99689651. The next prime is 99689663. The reversal of 99689657 is 75698699.

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 an interprime number because it is at equal distance from previous prime (99689651) and next prime (99689663).

It is a cyclic number.

It is not a de Polignac number, because 99689657 - 2⁴ = 99689641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99689596 and 99689605.

It is not an unprimeable number, because it can be changed into a prime (99689651) 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, 50363 + ... + 52304.

It is an arithmetic number, because the mean of its divisors is an integer number (24948324).

Almost surely, 2^99689657 is an apocalyptic number.

It is an amenable number.

99689657 is a deficient number, since it is larger than the sum of its proper divisors (103639).

99689657 is a wasteful number, since it uses less digits than its factorization.

99689657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103638.

The product of its digits is 7348320, while the sum is 59.

The square root of 99689657 is about 9984.4707921852. The cubic root of 99689657 is about 463.6782242527.

The spelling of 99689657 in words is "ninety-nine million, six hundred eighty-nine thousand, six hundred fifty-seven".