55623340 has 24 divisors (see below), whose sum is σ = 117023760. Its totient is φ = 22208448.

The previous prime is 55623329. The next prime is 55623349. The reversal of 55623340 is 4332655.

It is a junction number, because it is equal to n+sod(n) for n = 55623299 and 55623308.

It is not an unprimeable number, because it can be changed into a prime (55623349) 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, 10134 + ... + 14626.

It is an arithmetic number, because the mean of its divisors is an integer number (4875990).

Almost surely, 2^55623340 is an apocalyptic number.

It is an amenable number.

55623340 is an abundant number, since it is smaller than the sum of its proper divisors (61400420).

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

55623340 is a wasteful number, since it uses less digits than its factorization.

55623340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5121 (or 5119 counting only the distinct ones).

The product of its (nonzero) digits is 10800, while the sum is 28.

The square root of 55623340 is about 7458.1056576050. The cubic root of 55623340 is about 381.7265387493.

Adding to 55623340 its reverse (4332655), we get a palindrome (59955995).

The spelling of 55623340 in words is "fifty-five million, six hundred twenty-three thousand, three hundred forty".