99687040 has 64 divisors (see below), whose sum is σ = 240669000. Its totient is φ = 39481344.

The previous prime is 99687001. The next prime is 99687043. The reversal of 99687040 is 4078699.

It can be written as a sum of positive squares in 4 ways, for example, as 65674816 + 34012224 = 8104^2 + 5832^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-3 number, since 3×99687040³ (a number of 25 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (99687043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 69046 + ... + 70474.

Almost surely, 2^99687040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99687040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120334500).

99687040 is an abundant number, since it is smaller than the sum of its proper divisors (140981960).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99687040 is a wasteful number, since it uses less digits than its factorization.

99687040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557 (or 1545 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 43.

The square root of 99687040 is about 9984.3397378094. The cubic root of 99687040 is about 463.6741668056.

The spelling of 99687040 in words is "ninety-nine million, six hundred eighty-seven thousand, forty".