28400357 has 2 divisors, whose sum is σ = 28400358. Its totient is φ = 28400356.

The previous prime is 28400329. The next prime is 28400419. The reversal of 28400357 is 75300482.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28398241 + 2116 = 5329^2 + 46^2 .

It is a cyclic number.

It is not a de Polignac number, because 28400357 - 2¹⁴ = 28383973 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (28400327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14200178 + 14200179.

It is an arithmetic number, because the mean of its divisors is an integer number (14200179).

Almost surely, 2^28400357 is an apocalyptic number.

It is an amenable number.

28400357 is a deficient number, since it is larger than the sum of its proper divisors (1).

28400357 is an equidigital number, since it uses as much as digits as its factorization.

28400357 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6720, while the sum is 29.

The square root of 28400357 is about 5329.1985326126. The cubic root of 28400357 is about 305.0993387785.

The spelling of 28400357 in words is "twenty-eight million, four hundred thousand, three hundred fifty-seven".