28494457 has 2 divisors, whose sum is σ = 28494458. Its totient is φ = 28494456.

The previous prime is 28494451. The next prime is 28494461. The reversal of 28494457 is 75449482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26409321 + 2085136 = 5139^2 + 1444^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28494457 is a prime.

It is not a weakly prime, because it can be changed into another prime (28494451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14247228 + 14247229.

It is an arithmetic number, because the mean of its divisors is an integer number (14247229).

Almost surely, 2^28494457 is an apocalyptic number.

It is an amenable number.

28494457 is a deficient number, since it is larger than the sum of its proper divisors (1).

28494457 is an equidigital number, since it uses as much as digits as its factorization.

28494457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 322560, while the sum is 43.

The square root of 28494457 is about 5338.0199512553. The cubic root of 28494457 is about 305.4359331100.

The spelling of 28494457 in words is "twenty-eight million, four hundred ninety-four thousand, four hundred fifty-seven".