52785409 has 8 divisors (see below), whose sum is σ = 54181512. Its totient is φ = 51394560.

The previous prime is 52785377. The next prime is 52785419. The reversal of 52785409 is 90458725.

It can be written as a sum of positive squares in 4 ways, for example, as 2772225 + 50013184 = 1665^2 + 7072^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 52785409 - 2⁵ = 52785377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (52785419) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26637 + ... + 28549.

It is an arithmetic number, because the mean of its divisors is an integer number (6772689).

Almost surely, 2^52785409 is an apocalyptic number.

It is an amenable number.

52785409 is a deficient number, since it is larger than the sum of its proper divisors (1396103).

52785409 is a wasteful number, since it uses less digits than its factorization.

52785409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2627.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 52785409 is about 7265.3567703176. The cubic root of 52785409 is about 375.1209304795.

The spelling of 52785409 in words is "fifty-two million, seven hundred eighty-five thousand, four hundred nine".