55557138 has 64 divisors (see below), whose sum is σ = 138297600. Its totient is φ = 14487552.

The previous prime is 55557133. The next prime is 55557179. The reversal of 55557138 is 83175555.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55557096 and 55557105.

It is not an unprimeable number, because it can be changed into a prime (55557133) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 52438 + ... + 53486.

It is an arithmetic number, because the mean of its divisors is an integer number (2160900).

Almost surely, 2^55557138 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55557138, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69148800).

55557138 is an abundant number, since it is smaller than the sum of its proper divisors (82740462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55557138 is a wasteful number, since it uses less digits than its factorization.

55557138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1171.

The product of its digits is 105000, while the sum is 39.

The square root of 55557138 is about 7453.6660778438. Note that the first 3 decimals coincide. The cubic root of 55557138 is about 381.5750370434.

The spelling of 55557138 in words is "fifty-five million, five hundred fifty-seven thousand, one hundred thirty-eight".