99432557 has 4 divisors (see below), whose sum is σ = 113637216. Its totient is φ = 85227900.

The previous prime is 99432547. The next prime is 99432559. The reversal of 99432557 is 75523499.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 75523499 = 19 ⋅3974921.

It is a cyclic number.

It is not a de Polignac number, because 99432557 - 2⁶ = 99432493 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99432559) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7102319 + ... + 7102332.

It is an arithmetic number, because the mean of its divisors is an integer number (28409304).

Almost surely, 2^99432557 is an apocalyptic number.

It is an amenable number.

99432557 is a deficient number, since it is larger than the sum of its proper divisors (14204659).

99432557 is a wasteful number, since it uses less digits than its factorization.

99432557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14204658.

The product of its digits is 340200, while the sum is 44.

The square root of 99432557 is about 9971.5874864537. The cubic root of 99432557 is about 463.2792717951.

The spelling of 99432557 in words is "ninety-nine million, four hundred thirty-two thousand, five hundred fifty-seven".