56545389 has 12 divisors (see below), whose sum is σ = 84493500. Its totient is φ = 36396864.

The previous prime is 56545373. The next prime is 56545399. The reversal of 56545389 is 98354565.

56545389 is a `hidden beast` number, since 565 + 4 + 5 + 3 + 89 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 14516100 + 42029289 = 3810^2 + 6483^2 .

It is not a de Polignac number, because 56545389 - 2⁴ = 56545373 is a prime.

It is a super-2 number, since 2×56545389² = 6394762034322642, which contains 22 as substring.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56545399) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108064 + ... + 108585.

It is an arithmetic number, because the mean of its divisors is an integer number (7041125).

Almost surely, 2^56545389 is an apocalyptic number.

It is an amenable number.

56545389 is a deficient number, since it is larger than the sum of its proper divisors (27948111).

56545389 is a wasteful number, since it uses less digits than its factorization.

56545389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216684 (or 216681 counting only the distinct ones).

The product of its digits is 648000, while the sum is 45.

The square root of 56545389 is about 7519.6668144274. Note that the first 3 decimals coincide. The cubic root of 56545389 is about 383.8242400408.

It can be divided in two parts, 565 and 45389, that added together give a palindrome (45954).

The spelling of 56545389 in words is "fifty-six million, five hundred forty-five thousand, three hundred eighty-nine".