55547240 has 64 divisors (see below), whose sum is σ = 143544960. Its totient is φ = 18950400.

The previous prime is 55547207. The next prime is 55547263. The reversal of 55547240 is 4274555.

It is a junction number, because it is equal to n+sod(n) for n = 55547197 and 55547206.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 78890 + ... + 79590.

It is an arithmetic number, because the mean of its divisors is an integer number (2242890).

Almost surely, 2^55547240 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 55547240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71772480).

55547240 is an abundant number, since it is smaller than the sum of its proper divisors (87997720).

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

55547240 is a wasteful number, since it uses less digits than its factorization.

55547240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002 (or 998 counting only the distinct ones).

The product of its (nonzero) digits is 28000, while the sum is 32.

The square root of 55547240 is about 7453.0020796992. The cubic root of 55547240 is about 381.5523753647.

The spelling of 55547240 in words is "fifty-five million, five hundred forty-seven thousand, two hundred forty".