55362640 has 40 divisors (see below), whose sum is σ = 129598848. Its totient is φ = 21993600.

The previous prime is 55362631. The next prime is 55362641. The reversal of 55362640 is 4626355.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55362641) 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, 9789 + ... + 14371.

Almost surely, 2^55362640 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 55362640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64799424).

55362640 is an abundant number, since it is smaller than the sum of its proper divisors (74236208).

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

55362640 is a wasteful number, since it uses less digits than its factorization.

55362640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4747 (or 4741 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 55362640 is about 7440.6075020794. The cubic root of 55362640 is about 381.1292356019.

Adding to 55362640 its reverse (4626355), we get a palindrome (59988995).

The spelling of 55362640 in words is "fifty-five million, three hundred sixty-two thousand, six hundred forty".