99678431 has 8 divisors (see below), whose sum is σ = 100376064. Its totient is φ = 98983840.

The previous prime is 99678419. The next prime is 99678443. The reversal of 99678431 is 13487699.

It is an interprime number because it is at equal distance from previous prime (99678419) and next prime (99678443).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 99678431 - 2¹⁰ = 99677407 is a prime.

It is a super-2 number, since 2×99678431² = 19871579213243522, 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 (99678451) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 121001 + ... + 121821.

It is an arithmetic number, because the mean of its divisors is an integer number (12547008).

Almost surely, 2^99678431 is an apocalyptic number.

99678431 is a deficient number, since it is larger than the sum of its proper divisors (697633).

99678431 is a wasteful number, since it uses less digits than its factorization.

99678431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1521.

The product of its digits is 326592, while the sum is 47.

The square root of 99678431 is about 9983.9086033477. The cubic root of 99678431 is about 463.6608187455.

The spelling of 99678431 in words is "ninety-nine million, six hundred seventy-eight thousand, four hundred thirty-one".