55821478 has 8 divisors (see below), whose sum is σ = 84911760. Its totient is φ = 27517560.

The previous prime is 55821473. The next prime is 55821533. The reversal of 55821478 is 87412855.

55821478 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×55821478² = 6232074812208968, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 55821478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55821473) 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 3 ways as a sum of consecutive naturals, for example, 196413 + ... + 196696.

It is an arithmetic number, because the mean of its divisors is an integer number (10613970).

Almost surely, 2^55821478 is an apocalyptic number.

55821478 is a deficient number, since it is larger than the sum of its proper divisors (29090282).

55821478 is a wasteful number, since it uses less digits than its factorization.

55821478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 393182.

The product of its digits is 89600, while the sum is 40.

The square root of 55821478 is about 7471.3772492091. The cubic root of 55821478 is about 382.1792558004.

The spelling of 55821478 in words is "fifty-five million, eight hundred twenty-one thousand, four hundred seventy-eight".