99987523 has 8 divisors (see below), whose sum is σ = 106327728. Its totient is φ = 93698304.

The previous prime is 99987497. The next prime is 99987529. The reversal of 99987523 is 32578999.

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 99987523 - 2⁹ = 99987011 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (99987529) 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, 8661 + ... + 16582.

It is an arithmetic number, because the mean of its divisors is an integer number (13290966).

Almost surely, 2^99987523 is an apocalyptic number.

99987523 is a deficient number, since it is larger than the sum of its proper divisors (6340205).

99987523 is a wasteful number, since it uses less digits than its factorization.

99987523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25493.

The product of its digits is 1224720, while the sum is 52.

The square root of 99987523 is about 9999.3761305393. The cubic root of 99987523 is about 464.1395781904.

The spelling of 99987523 in words is "ninety-nine million, nine hundred eighty-seven thousand, five hundred twenty-three".