28501933 has 2 divisors, whose sum is σ = 28501934. Its totient is φ = 28501932.

The previous prime is 28501909. The next prime is 28501939. The reversal of 28501933 is 33910582.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21548164 + 6953769 = 4642^2 + 2637^2 .

It is a cyclic number.

It is not a de Polignac number, because 28501933 - 2¹⁷ = 28370861 is a prime.

It is equal to p_1770718 and since 28501933 and 1770718 have the same sum of digits, it is a Honaker prime.

It is a nialpdrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 28501895 and 28501904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28501939) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14250966 + 14250967.

It is an arithmetic number, because the mean of its divisors is an integer number (14250967).

Almost surely, 2^28501933 is an apocalyptic number.

It is an amenable number.

28501933 is a deficient number, since it is larger than the sum of its proper divisors (1).

28501933 is an equidigital number, since it uses as much as digits as its factorization.

28501933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 28501933 is about 5338.7201649834. The cubic root of 28501933 is about 305.4626428588.

The spelling of 28501933 in words is "twenty-eight million, five hundred one thousand, nine hundred thirty-three".