55143860 has 12 divisors (see below), whose sum is σ = 115802148. Its totient is φ = 22057536.

The previous prime is 55143859. The next prime is 55143883. The reversal of 55143860 is 6834155.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 16679056 + 38464804 = 4084^2 + 6202^2 .

It is a super-3 number, since 3×55143860³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1378577 + ... + 1378616.

It is an arithmetic number, because the mean of its divisors is an integer number (9650179).

Almost surely, 2^55143860 is an apocalyptic number.

It is an amenable number.

55143860 is an abundant number, since it is smaller than the sum of its proper divisors (60658288).

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

55143860 is a wasteful number, since it uses less digits than its factorization.

55143860 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2757202 (or 2757200 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 32.

The square root of 55143860 is about 7425.8911923082. The cubic root of 55143860 is about 380.6265287636.

The spelling of 55143860 in words is "fifty-five million, one hundred forty-three thousand, eight hundred sixty".