55307620 has 24 divisors (see below), whose sum is σ = 118339704. Its totient is φ = 21705216.

The previous prime is 55307597. The next prime is 55307639. The reversal of 55307620 is 2670355.

It can be written as a sum of positive squares in 4 ways, for example, as 191844 + 55115776 = 438^2 + 7424^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25029 + ... + 27148.

It is an arithmetic number, because the mean of its divisors is an integer number (4930821).

Almost surely, 2^55307620 is an apocalyptic number.

It is an amenable number.

55307620 is an abundant number, since it is smaller than the sum of its proper divisors (63032084).

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

55307620 is a wasteful number, since it uses less digits than its factorization.

55307620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52239 (or 52237 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 28.

The square root of 55307620 is about 7436.9093042742. The cubic root of 55307620 is about 381.0029369462.

Adding to 55307620 its reverse (2670355), we get a palindrome (57977975).

The spelling of 55307620 in words is "fifty-five million, three hundred seven thousand, six hundred twenty".