99670428 has 144 divisors (see below), whose sum is σ = 311875200. Its totient is φ = 26386560.

The previous prime is 99670397. The next prime is 99670451. The reversal of 99670428 is 82407699.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 97303 + ... + 98321.

It is an arithmetic number, because the mean of its divisors is an integer number (2165800).

Almost surely, 2^99670428 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99670428, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155937600).

99670428 is an abundant number, since it is smaller than the sum of its proper divisors (212204772).

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

99670428 is a wasteful number, since it uses less digits than its factorization.

99670428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1072 (or 1067 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 99670428 is about 9983.5078003676. The cubic root of 99670428 is about 463.6484095853.

The spelling of 99670428 in words is "ninety-nine million, six hundred seventy thousand, four hundred twenty-eight".