99621693 has 24 divisors (see below), whose sum is σ = 156366080. Its totient is φ = 60886080.

The previous prime is 99621673. The next prime is 99621707. The reversal of 99621693 is 39612699.

It is a happy number.

It is not a de Polignac number, because 99621693 - 2⁶ = 99621629 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99621673) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4096 + ... + 14697.

Almost surely, 2^99621693 is an apocalyptic number.

99621693 is a gapful number since it is divisible by the number (93) formed by its first and last digit.

It is an amenable number.

99621693 is a deficient number, since it is larger than the sum of its proper divisors (56744387).

99621693 is a wasteful number, since it uses less digits than its factorization.

99621693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18849 (or 18846 counting only the distinct ones).

The product of its digits is 157464, while the sum is 45.

The square root of 99621693 is about 9981.0667265578. The cubic root of 99621693 is about 463.5728285277.

The spelling of 99621693 in words is "ninety-nine million, six hundred twenty-one thousand, six hundred ninety-three".