55316520 has 224 divisors, whose sum is σ = 214053120. Its totient is φ = 12597120.

The previous prime is 55316483. The next prime is 55316557. The reversal of 55316520 is 2561355.

55316520 is a `hidden beast` number, since 5 + 5 + 3 + 1 + 652 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (55316483) and next prime (55316557).

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 203985 + ... + 204255.

Almost surely, 2^55316520 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55316520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107026560).

55316520 is an abundant number, since it is smaller than the sum of its proper divisors (158736600).

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

55316520 is a wasteful number, since it uses less digits than its factorization.

55316520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 4500, while the sum is 27.

The square root of 55316520 is about 7437.5076470549. The cubic root of 55316520 is about 381.0233726129.

Adding to 55316520 its reverse (2561355), we get a palindrome (57877875).

The spelling of 55316520 in words is "fifty-five million, three hundred sixteen thousand, five hundred twenty".