55628569 has 2 divisors, whose sum is σ = 55628570. Its totient is φ = 55628568.

The previous prime is 55628567. The next prime is 55628579. The reversal of 55628569 is 96582655.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 52345225 + 3283344 = 7235^2 + 1812^2 .

It is a cyclic number.

It is not a de Polignac number, because 55628569 - 2¹ = 55628567 is a prime.

It is a super-2 number, since 2×55628569² = 6189075377975522, which contains 22 as substring.

Together with 55628567, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (55628567) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27814284 + 27814285.

It is an arithmetic number, because the mean of its divisors is an integer number (27814285).

Almost surely, 2^55628569 is an apocalyptic number.

It is an amenable number.

55628569 is a deficient number, since it is larger than the sum of its proper divisors (1).

55628569 is an equidigital number, since it uses as much as digits as its factorization.

55628569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 648000, while the sum is 46.

The square root of 55628569 is about 7458.4562075539. The cubic root of 55628569 is about 381.7385000682.

The spelling of 55628569 in words is "fifty-five million, six hundred twenty-eight thousand, five hundred sixty-nine".