56667889 has 2 divisors, whose sum is σ = 56667890.
Its totient is φ = 56667888.
The previous prime is 56667887. The next prime is 56667911. The reversal of 56667889 is 98876665.
It is a happy number.
It is a weak prime.
It can be written as a sum of positive squares in only one way, i.e., 43125489 + 13542400 = 6567^2 + 3680^2
It is a cyclic number.
It is not a de Polignac number, because 56667889 - 21 = 56667887 is a prime.
It is a super-2 number, since 2×566678892 = 6422499287432642, which contains 22 as substring.
Together with 56667887, it forms a pair of twin primes.
It is a plaindrome in base 10.
It is not a weakly prime, because it can be changed into another prime (56667881) by changing a digit.
It is a polite number, since it can be written as a sum of consecutive naturals, namely, 28333944 + 28333945.
It is an arithmetic number, because the mean of its divisors is an integer number (28333945).
Almost surely, 256667889 is an apocalyptic number.
It is an amenable number.
56667889 is a deficient number, since it is larger than the sum of its proper divisors (1).
56667889 is an equidigital number, since it uses as much as digits as its factorization.
56667889 is an evil number, because the sum of its binary digits is even.
The product of its digits is 4354560, while the sum is 55.
The square root of 56667889 is about 7527.8077153976.
The cubic root of 56667889 is about 384.1012125603.
The spelling of 56667889 in words is "fifty-six million, six hundred sixty-seven thousand, eight hundred eighty-nine".