82758409 has 2 divisors, whose sum is σ = 82758410. Its totient is φ = 82758408.

The previous prime is 82758371. The next prime is 82758413. The reversal of 82758409 is 90485728.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44355600 + 38402809 = 6660^2 + 6197^2 .

It is a cyclic number.

It is not a de Polignac number, because 82758409 - 2⁹ = 82757897 is a prime.

It is a super-2 number, since 2×82758409² = 13697908520422562, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (82758469) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41379204 + 41379205.

It is an arithmetic number, because the mean of its divisors is an integer number (41379205).

Almost surely, 2^82758409 is an apocalyptic number.

It is an amenable number.

82758409 is a deficient number, since it is larger than the sum of its proper divisors (1).

82758409 is an equidigital number, since it uses as much as digits as its factorization.

82758409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 161280, while the sum is 43.

The square root of 82758409 is about 9097.1648880297. The cubic root of 82758409 is about 435.7834281285.

The spelling of 82758409 in words is "eighty-two million, seven hundred fifty-eight thousand, four hundred nine".