28624297 has 8 divisors (see below), whose sum is σ = 30985416. Its totient is φ = 26285952.

The previous prime is 28624231. The next prime is 28624303. The reversal of 28624297 is 79242682.

It can be written as a sum of positive squares in 4 ways, for example, as 12752041 + 15872256 = 3571^2 + 3984^2 .

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 28624297 - 2¹¹ = 28622249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28624217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3028 + ... + 8149.

It is an arithmetic number, because the mean of its divisors is an integer number (3873177).

Almost surely, 2^28624297 is an apocalyptic number.

It is an amenable number.

28624297 is a deficient number, since it is larger than the sum of its proper divisors (2361119).

28624297 is a wasteful number, since it uses less digits than its factorization.

28624297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11387.

The product of its digits is 96768, while the sum is 40.

The square root of 28624297 is about 5350.1679412893. The cubic root of 28624297 is about 305.8991544033.

The spelling of 28624297 in words is "twenty-eight million, six hundred twenty-four thousand, two hundred ninety-seven".