57820409 has 2 divisors, whose sum is σ = 57820410. Its totient is φ = 57820408.

The previous prime is 57820393. The next prime is 57820421. The reversal of 57820409 is 90402875.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46240000 + 11580409 = 6800^2 + 3403^2 .

It is a cyclic number.

It is not a de Polignac number, because 57820409 - 2⁴ = 57820393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (57820429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28910204 + 28910205.

It is an arithmetic number, because the mean of its divisors is an integer number (28910205).

Almost surely, 2^57820409 is an apocalyptic number.

It is an amenable number.

57820409 is a deficient number, since it is larger than the sum of its proper divisors (1).

57820409 is an equidigital number, since it uses as much as digits as its factorization.

57820409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 20160, while the sum is 35.

The square root of 57820409 is about 7603.9732377225. The cubic root of 57820409 is about 386.6877253526.

The spelling of 57820409 in words is "fifty-seven million, eight hundred twenty thousand, four hundred nine".