99870540 has 96 divisors (see below), whose sum is σ = 348655104. Its totient is φ = 20751360.

The previous prime is 99870523. The next prime is 99870541. The reversal of 99870540 is 4507899.

It is a super-3 number, since 3×99870540³ (a number of 25 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 99870492 and 99870501.

It is not an unprimeable number, because it can be changed into a prime (99870541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6189 + ... + 15428.

It is an arithmetic number, because the mean of its divisors is an integer number (3631824).

Almost surely, 2^99870540 is an apocalyptic number.

It is an amenable number.

99870540 is an abundant number, since it is smaller than the sum of its proper divisors (248784564).

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

99870540 is a wasteful number, since it uses less digits than its factorization.

99870540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21647 (or 21645 counting only the distinct ones).

The product of its (nonzero) digits is 90720, while the sum is 42.

The square root of 99870540 is about 9993.5249036564. The cubic root of 99870540 is about 463.9584968328.

The spelling of 99870540 in words is "ninety-nine million, eight hundred seventy thousand, five hundred forty".