55521630 has 48 divisors (see below), whose sum is σ = 144774864. Its totient is φ = 14762880.

The previous prime is 55521611. The next prime is 55521649. The reversal of 55521630 is 3612555.

55521630 is a `hidden beast` number, since 5 + 5 + 5 + 21 + 630 = 666.

It is an interprime number because it is at equal distance from previous prime (55521611) and next prime (55521649).

It is a junction number, because it is equal to n+sod(n) for n = 55521594 and 55521603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 41370 + ... + 42690.

It is an arithmetic number, because the mean of its divisors is an integer number (3016143).

Almost surely, 2^55521630 is an apocalyptic number.

55521630 is an abundant number, since it is smaller than the sum of its proper divisors (89253234).

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

55521630 is a wasteful number, since it uses less digits than its factorization.

55521630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1801 (or 1798 counting only the distinct ones).

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

The square root of 55521630 is about 7451.2837820070. The cubic root of 55521630 is about 381.4937282358.

The spelling of 55521630 in words is "fifty-five million, five hundred twenty-one thousand, six hundred thirty".