99533639 has 16 divisors (see below), whose sum is σ = 104457600. Its totient is φ = 94767360.

The previous prime is 99533633. The next prime is 99533641. The reversal of 99533639 is 93633599.

It is a happy number.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-99533639 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 99533593 and 99533602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99533633) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 427067 + ... + 427299.

It is an arithmetic number, because the mean of its divisors is an integer number (6528600).

Almost surely, 2^99533639 is an apocalyptic number.

99533639 is a deficient number, since it is larger than the sum of its proper divisors (4923961).

99533639 is a wasteful number, since it uses less digits than its factorization.

99533639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 490.

The product of its digits is 590490, while the sum is 47.

The square root of 99533639 is about 9976.6546998480. The cubic root of 99533639 is about 463.4362067637.

The spelling of 99533639 in words is "ninety-nine million, five hundred thirty-three thousand, six hundred thirty-nine".