28640599 has 6 divisors (see below), whose sum is σ = 31013376. Its totient is φ = 26437320.

The previous prime is 28640587. The next prime is 28640609. The reversal of 28640599 is 99504682.

It is not a de Polignac number, because 28640599 - 2¹³ = 28632407 is a prime.

It is a super-2 number, since 2×28640599² = 1640567822157602, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28640519) 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 5 ways as a sum of consecutive naturals, for example, 84567 + ... + 84904.

It is an arithmetic number, because the mean of its divisors is an integer number (5168896).

Almost surely, 2^28640599 is an apocalyptic number.

28640599 is a deficient number, since it is larger than the sum of its proper divisors (2372777).

28640599 is a wasteful number, since it uses less digits than its factorization.

28640599 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 169497 (or 169484 counting only the distinct ones).

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

The square root of 28640599 is about 5351.6912280138. The cubic root of 28640599 is about 305.9572148875.

The spelling of 28640599 in words is "twenty-eight million, six hundred forty thousand, five hundred ninety-nine".