55007730 has 48 divisors (see below), whose sum is σ = 144517464. Its totient is φ = 14515200.

The previous prime is 55007723. The next prime is 55007749. The reversal of 55007730 is 3770055.

It can be written as a sum of positive squares in 4 ways, for example, as 45441081 + 9566649 = 6741^2 + 3093^2 .

It is a junction number, because it is equal to n+sod(n) for n = 55007694 and 55007703.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5580 + ... + 11880.

Almost surely, 2^55007730 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55007730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72258732).

55007730 is an abundant number, since it is smaller than the sum of its proper divisors (89509734).

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

55007730 is a wasteful number, since it uses less digits than its factorization.

55007730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6411 (or 6408 counting only the distinct ones).

The product of its (nonzero) digits is 3675, while the sum is 27.

The square root of 55007730 is about 7416.7196252791. The cubic root of 55007730 is about 380.3130614976.

Adding to 55007730 its reverse (3770055), we get a palindrome (58777785).

The spelling of 55007730 in words is "fifty-five million, seven thousand, seven hundred thirty".