55557789 has 16 divisors (see below), whose sum is σ = 84822528. Its totient is φ = 31686192.

The previous prime is 55557787. The next prime is 55557791. The reversal of 55557789 is 98775555.

It is an interprime number because it is at equal distance from previous prime (55557787) and next prime (55557791).

It is not a de Polignac number, because 55557789 - 2¹ = 55557787 is a prime.

It is a Curzon number.

It is a plaindrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55557787) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10074 + ... + 14580.

It is an arithmetic number, because the mean of its divisors is an integer number (5301408).

Almost surely, 2^55557789 is an apocalyptic number.

It is an amenable number.

55557789 is a deficient number, since it is larger than the sum of its proper divisors (29264739).

55557789 is a wasteful number, since it uses less digits than its factorization.

55557789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5104.

The product of its digits is 2205000, while the sum is 51.

The square root of 55557789 is about 7453.7097475016. The cubic root of 55557789 is about 381.5765274273.

The spelling of 55557789 in words is "fifty-five million, five hundred fifty-seven thousand, seven hundred eighty-nine".