53551620 has 36 divisors (see below), whose sum is σ = 162440460. Its totient is φ = 14280384.

The previous prime is 53551583. The next prime is 53551627. The reversal of 53551620 is 2615535.

53551620 is a `hidden beast` number, since 5 + 35 + 5 + 1 + 620 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 41062464 + 12489156 = 6408^2 + 3534^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (53551627) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 148575 + ... + 148934.

It is an arithmetic number, because the mean of its divisors is an integer number (4512235).

Almost surely, 2^53551620 is an apocalyptic number.

It is an amenable number.

53551620 is an abundant number, since it is smaller than the sum of its proper divisors (108888840).

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

53551620 is a wasteful number, since it uses less digits than its factorization.

53551620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 297524 (or 297519 counting only the distinct ones).

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

The square root of 53551620 is about 7317.8972389615. The cubic root of 53551620 is about 376.9272515690.

The spelling of 53551620 in words is "fifty-three million, five hundred fifty-one thousand, six hundred twenty".