55443540 has 24 divisors (see below), whose sum is σ = 155242080. Its totient is φ = 14784928.

The previous prime is 55443533. The next prime is 55443569. The reversal of 55443540 is 4534455.

It is a super-2 number, since 2×55443540² = 6147972255463200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 55443498 and 55443507.

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, 461970 + ... + 462089.

It is an arithmetic number, because the mean of its divisors is an integer number (6468420).

Almost surely, 2^55443540 is an apocalyptic number.

It is an amenable number.

55443540 is an abundant number, since it is smaller than the sum of its proper divisors (99798540).

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

55443540 is a wasteful number, since it uses less digits than its factorization.

55443540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 924071 (or 924069 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 30.

The square root of 55443540 is about 7446.0419015743. The cubic root of 55443540 is about 381.3147900280.

Adding to 55443540 its reverse (4534455), we get a palindrome (59977995).

The spelling of 55443540 in words is "fifty-five million, four hundred forty-three thousand, five hundred forty".