55478500 has 144 divisors (see below), whose sum is σ = 153369216. Its totient is φ = 17160000.

The previous prime is 55478419. The next prime is 55478509. The reversal of 55478500 is 587455.

It is not an unprimeable number, because it can be changed into a prime (55478509) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 423435 + ... + 423565.

It is an arithmetic number, because the mean of its divisors is an integer number (1065064).

Almost surely, 2^55478500 is an apocalyptic number.

55478500 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 55478500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (76684608).

55478500 is an abundant number, since it is smaller than the sum of its proper divisors (97890716).

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

55478500 is a wasteful number, since it uses less digits than its factorization.

55478500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 179 (or 156 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 34.

The square root of 55478500 is about 7448.3890875813. The cubic root of 55478500 is about 381.3949193760.

The spelling of 55478500 in words is "fifty-five million, four hundred seventy-eight thousand, five hundred".