55807872 has 128 divisors (see below), whose sum is σ = 160392960. Its totient is φ = 17129472.

The previous prime is 55807841. The next prime is 55807879. The reversal of 55807872 is 27870855.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×55807872² = 6229037154336768, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55807879) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 541773 + ... + 541875.

It is an arithmetic number, because the mean of its divisors is an integer number (1253070).

Almost surely, 2^55807872 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 55807872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80196480).

55807872 is an abundant number, since it is smaller than the sum of its proper divisors (104585088).

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

55807872 is a wasteful number, since it uses less digits than its factorization.

55807872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its (nonzero) digits is 156800, while the sum is 42.

The square root of 55807872 is about 7470.4666520908. The cubic root of 55807872 is about 382.1482023201.

The spelling of 55807872 in words is "fifty-five million, eight hundred seven thousand, eight hundred seventy-two".