55107820 has 24 divisors (see below), whose sum is σ = 115869600. Its totient is φ = 22015872.

The previous prime is 55107817. The next prime is 55107823. The reversal of 55107820 is 2870155.

It is an interprime number because it is at equal distance from previous prime (55107817) and next prime (55107823).

It is not an unprimeable number, because it can be changed into a prime (55107823) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25336 + ... + 27424.

It is an arithmetic number, because the mean of its divisors is an integer number (4827900).

Almost surely, 2^55107820 is an apocalyptic number.

It is an amenable number.

55107820 is an abundant number, since it is smaller than the sum of its proper divisors (60761780).

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

55107820 is a wasteful number, since it uses less digits than its factorization.

55107820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3417 (or 3415 counting only the distinct ones).

The product of its (nonzero) digits is 2800, while the sum is 28.

The square root of 55107820 is about 7423.4641509204. The cubic root of 55107820 is about 380.5435895228.

Adding to 55107820 its reverse (2870155), we get a palindrome (57977975).

The spelling of 55107820 in words is "fifty-five million, one hundred seven thousand, eight hundred twenty".