99428506 has 4 divisors (see below), whose sum is σ = 149142762. Its totient is φ = 49714252.

The previous prime is 99428489. The next prime is 99428521. The reversal of 99428506 is 60582499.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 60582499 = 4967 ⋅12197.

It can be written as a sum of positive squares in only one way, i.e., 58660281 + 40768225 = 7659^2 + 6385^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24857125 + ... + 24857128.

Almost surely, 2^99428506 is an apocalyptic number.

99428506 is a deficient number, since it is larger than the sum of its proper divisors (49714256).

99428506 is a wasteful number, since it uses less digits than its factorization.

99428506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49714255.

The product of its (nonzero) digits is 155520, while the sum is 43.

The square root of 99428506 is about 9971.3843572495. The cubic root of 99428506 is about 463.2729801944.

The spelling of 99428506 in words is "ninety-nine million, four hundred twenty-eight thousand, five hundred six".