55557780 has 48 divisors (see below), whose sum is σ = 158505984. Its totient is φ = 14535040.

The previous prime is 55557731. The next prime is 55557787. The reversal of 55557780 is 8775555.

It is a happy number.

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, 5556 + ... + 11915.

It is an arithmetic number, because the mean of its divisors is an integer number (3302208).

Almost surely, 2^55557780 is an apocalyptic number.

It is an amenable number.

55557780 is an abundant number, since it is smaller than the sum of its proper divisors (102948204).

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

55557780 is a wasteful number, since it uses less digits than its factorization.

55557780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17536 (or 17534 counting only the distinct ones).

The product of its (nonzero) digits is 245000, while the sum is 42.

The square root of 55557780 is about 7453.7091437753. The cubic root of 55557780 is about 381.5765068229.

The spelling of 55557780 in words is "fifty-five million, five hundred fifty-seven thousand, seven hundred eighty".