99688381 has 4 divisors (see below), whose sum is σ = 107356732. Its totient is φ = 92020032.

The previous prime is 99688373. The next prime is 99688411. The reversal of 99688381 is 18388699.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 8791225 + 90897156 = 2965^2 + 9534^2 .

It is not a de Polignac number, because 99688381 - 2³ = 99688373 is a prime.

It is a super-2 number, since 2×99688381² = 19875546612802322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99688321) 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, 3834156 + ... + 3834181.

It is an arithmetic number, because the mean of its divisors is an integer number (26839183).

Almost surely, 2^99688381 is an apocalyptic number.

99688381 is the 5765-th hex number.

It is an amenable number.

99688381 is a deficient number, since it is larger than the sum of its proper divisors (7668351).

99688381 is a wasteful number, since it uses less digits than its factorization.

99688381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7668350.

The product of its digits is 746496, while the sum is 52.

The square root of 99688381 is about 9984.4068927503. The cubic root of 99688381 is about 463.6762459267.

The spelling of 99688381 in words is "ninety-nine million, six hundred eighty-eight thousand, three hundred eighty-one".