53778321 has 6 divisors (see below), whose sum is σ = 77679810. Its totient is φ = 35852208.

The previous prime is 53778317. The next prime is 53778331. The reversal of 53778321 is 12387735.

53778321 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 50126400 + 3651921 = 7080^2 + 1911^2 .

It is not a de Polignac number, because 53778321 - 2² = 53778317 is a prime.

It is not an unprimeable number, because it can be changed into a prime (53778331) 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 5 ways as a sum of consecutive naturals, for example, 2987676 + ... + 2987693.

It is an arithmetic number, because the mean of its divisors is an integer number (12946635).

Almost surely, 2^53778321 is an apocalyptic number.

It is an amenable number.

53778321 is a deficient number, since it is larger than the sum of its proper divisors (23901489).

53778321 is a wasteful number, since it uses less digits than its factorization.

53778321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5975375 (or 5975372 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 53778321 is about 7333.3703711186. The cubic root of 53778321 is about 377.4583870041.

The spelling of 53778321 in words is "fifty-three million, seven hundred seventy-eight thousand, three hundred twenty-one".