55213840 has 40 divisors (see below), whose sum is σ = 140044608. Its totient is φ = 20077440.

The previous prime is 55213831. The next prime is 55213843. The reversal of 55213840 is 4831255.

55213840 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 55213799 and 55213808.

It is not an unprimeable number, because it can be changed into a prime (55213843) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30492 + ... + 32251.

Almost surely, 2^55213840 is an apocalyptic number.

It is an amenable number.

55213840 is an abundant number, since it is smaller than the sum of its proper divisors (84830768).

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

55213840 is a wasteful number, since it uses less digits than its factorization.

55213840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62767 (or 62761 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 55213840 is about 7430.6015907193. The cubic root of 55213840 is about 380.7874713412.

The spelling of 55213840 in words is "fifty-five million, two hundred thirteen thousand, eight hundred forty".