55349280 has 432 divisors, whose sum is σ = 241375680. Its totient is φ = 11280384.

The previous prime is 55349279. The next prime is 55349323. The reversal of 55349280 is 8294355.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2913111 + ... + 2913129.

It is an arithmetic number, because the mean of its divisors is an integer number (558740).

Almost surely, 2^55349280 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 55349280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120687840).

55349280 is an abundant number, since it is smaller than the sum of its proper divisors (186026400).

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

55349280 is a wasteful number, since it uses less digits than its factorization.

55349280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81 (or 53 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 36.

The square root of 55349280 is about 7439.7096717547. The cubic root of 55349280 is about 381.0985753575.

The spelling of 55349280 in words is "fifty-five million, three hundred forty-nine thousand, two hundred eighty".