55809340 has 24 divisors (see below), whose sum is σ = 121242240. Its totient is φ = 21553728.

The previous prime is 55809307. The next prime is 55809367. The reversal of 55809340 is 4390855.

It is a super-2 number, since 2×55809340² = 6229364862471200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 55809296 and 55809305.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47532 + ... + 48691.

It is an arithmetic number, because the mean of its divisors is an integer number (5051760).

Almost surely, 2^55809340 is an apocalyptic number.

It is an amenable number.

55809340 is an abundant number, since it is smaller than the sum of its proper divisors (65432900).

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

55809340 is a wasteful number, since it uses less digits than its factorization.

55809340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96261 (or 96259 counting only the distinct ones).

The product of its (nonzero) digits is 21600, while the sum is 34.

The square root of 55809340 is about 7470.5649050122. The cubic root of 55809340 is about 382.1515530340.

The spelling of 55809340 in words is "fifty-five million, eight hundred nine thousand, three hundred forty".