28491553 has 2 divisors, whose sum is σ = 28491554. Its totient is φ = 28491552.

The previous prime is 28491523. The next prime is 28491563. The reversal of 28491553 is 35519482.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19918369 + 8573184 = 4463^2 + 2928^2 .

It is a cyclic number.

It is not a de Polignac number, because 28491553 - 2⁵ = 28491521 is a prime.

It is not a weakly prime, because it can be changed into another prime (28491523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14245776 + 14245777.

It is an arithmetic number, because the mean of its divisors is an integer number (14245777).

Almost surely, 2^28491553 is an apocalyptic number.

It is an amenable number.

28491553 is a deficient number, since it is larger than the sum of its proper divisors (1).

28491553 is an equidigital number, since it uses as much as digits as its factorization.

28491553 is an evil number, because the sum of its binary digits is even.

The product of its digits is 43200, while the sum is 37.

The square root of 28491553 is about 5337.7479333517. The cubic root of 28491553 is about 305.4255566348.

The spelling of 28491553 in words is "twenty-eight million, four hundred ninety-one thousand, five hundred fifty-three".