55490000 has 100 divisors (see below), whose sum is σ = 139455360. Its totient is φ = 21360000.

The previous prime is 55489999. The next prime is 55490027. The reversal of 55490000 is 9455.

It is a tau number, because it is divible by the number of its divisors (100).

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, 309911 + ... + 310089.

Almost surely, 2^55490000 is an apocalyptic number.

55490000 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 55490000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69727680).

55490000 is an abundant number, since it is smaller than the sum of its proper divisors (83965360).

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

55490000 is a wasteful number, since it uses less digits than its factorization.

55490000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 238 (or 217 counting only the distinct ones).

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 55490000 is about 7449.1610265855. The cubic root of 55490000 is about 381.4212703561.

Adding to 55490000 its reverse (9455), we get a palindrome (55499455).

The spelling of 55490000 in words is "fifty-five million, four hundred ninety thousand".