55309340 has 24 divisors (see below), whose sum is σ = 116348400. Its totient is φ = 22085888.

The previous prime is 55309333. The next prime is 55309343. The reversal of 55309340 is 4390355.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55309343) 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, 11636 + ... + 15684.

It is an arithmetic number, because the mean of its divisors is an integer number (4847850).

Almost surely, 2^55309340 is an apocalyptic number.

It is an amenable number.

55309340 is an abundant number, since it is smaller than the sum of its proper divisors (61039060).

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

55309340 is a wasteful number, since it uses less digits than its factorization.

55309340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4741 (or 4739 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 29.

The square root of 55309340 is about 7437.0249428115. The cubic root of 55309340 is about 381.0068864819.

Adding to 55309340 its reverse (4390355), we get a palindrome (59699695).

The spelling of 55309340 in words is "fifty-five million, three hundred nine thousand, three hundred forty".