55557500 has 60 divisors (see below), whose sum is σ = 123597936. Its totient is φ = 21840000.

The previous prime is 55557499. The next prime is 55557511. The reversal of 55557500 is 575555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 177344 + ... + 177656.

Almost surely, 2^55557500 is an apocalyptic number.

55557500 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55557500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61798968).

55557500 is an abundant number, since it is smaller than the sum of its proper divisors (68040436).

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

55557500 is a wasteful number, since it uses less digits than its factorization.

55557500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408 (or 391 counting only the distinct ones).

The product of its (nonzero) digits is 21875, while the sum is 32.

The square root of 55557500 is about 7453.6903611567. The cubic root of 55557500 is about 381.5758657990.

The spelling of 55557500 in words is "fifty-five million, five hundred fifty-seven thousand, five hundred".