55515030 has 64 divisors (see below), whose sum is σ = 142041600. Its totient is φ = 13837824.

The previous prime is 55515023. The next prime is 55515041. The reversal of 55515030 is 3051555.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 101217 + ... + 101763.

It is an arithmetic number, because the mean of its divisors is an integer number (2219400).

Almost surely, 2^55515030 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55515030, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71020800).

55515030 is an abundant number, since it is smaller than the sum of its proper divisors (86526570).

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

55515030 is a wasteful number, since it uses less digits than its factorization.

55515030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 773.

The product of its (nonzero) digits is 1875, while the sum is 24.

The square root of 55515030 is about 7450.8408921410. The cubic root of 55515030 is about 381.4786112542.

Adding to 55515030 its reverse (3051555), we get a palindrome (58566585).

The spelling of 55515030 in words is "fifty-five million, five hundred fifteen thousand, thirty".