55247616 has 72 divisors (see below), whose sum is σ = 163397360. Its totient is φ = 18413568.

The previous prime is 55247593. The next prime is 55247617. The reversal of 55247616 is 61674255.

It is a happy number.

55247616 is a `hidden beast` number, since 552 + 47 + 61 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (55247617) 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, 2916 + ... + 10908.

Almost surely, 2^55247616 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 55247616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81698680).

55247616 is an abundant number, since it is smaller than the sum of its proper divisors (108149744).

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

55247616 is an equidigital number, since it uses as much as digits as its factorization.

55247616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8018 (or 7998 counting only the distinct ones).

The product of its digits is 50400, while the sum is 36.

The square root of 55247616 is about 7432.8740067352. The cubic root of 55247616 is about 380.8651019735.

The spelling of 55247616 in words is "fifty-five million, two hundred forty-seven thousand, six hundred sixteen".