28732399 has 2 divisors, whose sum is σ = 28732400. Its totient is φ = 28732398.

The previous prime is 28732373. The next prime is 28732409. The reversal of 28732399 is 99323782.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 28732399 - 2⁷ = 28732271 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28732309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14366199 + 14366200.

It is an arithmetic number, because the mean of its divisors is an integer number (14366200).

Almost surely, 2^28732399 is an apocalyptic number.

28732399 is a deficient number, since it is larger than the sum of its proper divisors (1).

28732399 is an equidigital number, since it uses as much as digits as its factorization.

28732399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 163296, while the sum is 43.

The square root of 28732399 is about 5360.2610943871. The cubic root of 28732399 is about 306.2837550465.

The spelling of 28732399 in words is "twenty-eight million, seven hundred thirty-two thousand, three hundred ninety-nine".