56867809 has 2 divisors, whose sum is σ = 56867810. Its totient is φ = 56867808.

The previous prime is 56867749. The next prime is 56867821. The reversal of 56867809 is 90876865.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49561600 + 7306209 = 7040^2 + 2703^2 .

It is a cyclic number.

It is not a de Polignac number, because 56867809 - 2¹¹ = 56865761 is a prime.

It is not a weakly prime, because it can be changed into another prime (56867879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28433904 + 28433905.

It is an arithmetic number, because the mean of its divisors is an integer number (28433905).

Almost surely, 2^56867809 is an apocalyptic number.

It is an amenable number.

56867809 is a deficient number, since it is larger than the sum of its proper divisors (1).

56867809 is an equidigital number, since it uses as much as digits as its factorization.

56867809 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 725760, while the sum is 49.

The square root of 56867809 is about 7541.0747907709. The cubic root of 56867809 is about 384.5523757018.

The spelling of 56867809 in words is "fifty-six million, eight hundred sixty-seven thousand, eight hundred nine".