55427280 has 80 divisors (see below), whose sum is σ = 173036544. Its totient is φ = 14676480.

The previous prime is 55427257. The next prime is 55427303. The reversal of 55427280 is 8272455.

It is an interprime number because it is at equal distance from previous prime (55427257) and next prime (55427303).

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36945 + ... + 38415.

Almost surely, 2^55427280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55427280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86518272).

55427280 is an abundant number, since it is smaller than the sum of its proper divisors (117609264).

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

55427280 is a wasteful number, since it uses less digits than its factorization.

55427280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1644 (or 1638 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 33.

The square root of 55427280 is about 7444.9499662523. The cubic root of 55427280 is about 381.2775101532.

The spelling of 55427280 in words is "fifty-five million, four hundred twenty-seven thousand, two hundred eighty".