55216740 has 24 divisors (see below), whose sum is σ = 154607040. Its totient is φ = 14724448.

The previous prime is 55216649. The next prime is 55216741. The reversal of 55216740 is 4761255.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55216698 and 55216707.

It is not an unprimeable number, because it can be changed into a prime (55216741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460080 + ... + 460199.

It is an arithmetic number, because the mean of its divisors is an integer number (6441960).

Almost surely, 2^55216740 is an apocalyptic number.

It is an amenable number.

55216740 is an abundant number, since it is smaller than the sum of its proper divisors (99390300).

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

55216740 is a wasteful number, since it uses less digits than its factorization.

55216740 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 920291 (or 920289 counting only the distinct ones).

The product of its (nonzero) digits is 8400, while the sum is 30.

The square root of 55216740 is about 7430.7967271350. The cubic root of 55216740 is about 380.7941379326.

Adding to 55216740 its reverse (4761255), we get a palindrome (59977995).

The spelling of 55216740 in words is "fifty-five million, two hundred sixteen thousand, seven hundred forty".