28437121 has 2 divisors, whose sum is σ = 28437122. Its totient is φ = 28437120.

The previous prime is 28437113. The next prime is 28437151. The reversal of 28437121 is 12173482.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28206721 + 230400 = 5311^2 + 480^2 .

It is a cyclic number.

It is not a de Polignac number, because 28437121 - 2³ = 28437113 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 28437121.

It is not a weakly prime, because it can be changed into another prime (28437151) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14218560 + 14218561.

It is an arithmetic number, because the mean of its divisors is an integer number (14218561).

Almost surely, 2^28437121 is an apocalyptic number.

It is an amenable number.

28437121 is a deficient number, since it is larger than the sum of its proper divisors (1).

28437121 is an equidigital number, since it uses as much as digits as its factorization.

28437121 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2688, while the sum is 28.

The square root of 28437121 is about 5332.6467162189. The cubic root of 28437121 is about 305.2309314390.

The spelling of 28437121 in words is "twenty-eight million, four hundred thirty-seven thousand, one hundred twenty-one".