28570769 has 2 divisors, whose sum is σ = 28570770. Its totient is φ = 28570768.

The previous prime is 28570741. The next prime is 28570781. The reversal of 28570769 is 96707582.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 16908544 + 11662225 = 4112^2 + 3415^2 .

It is a cyclic number.

It is not a de Polignac number, because 28570769 - 2¹² = 28566673 is a prime.

It is a super-2 number, since 2×28570769² = 1632577682502722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (28570739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 14285384 + 14285385.

It is an arithmetic number, because the mean of its divisors is an integer number (14285385).

Almost surely, 2^28570769 is an apocalyptic number.

It is an amenable number.

28570769 is a deficient number, since it is larger than the sum of its proper divisors (1).

28570769 is an equidigital number, since it uses as much as digits as its factorization.

28570769 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 28570769 is about 5345.1631406347. The cubic root of 28570769 is about 305.7083562709.

The spelling of 28570769 in words is "twenty-eight million, five hundred seventy thousand, seven hundred sixty-nine".