55203778 has 64 divisors (see below), whose sum is σ = 105062400. Its totient is φ = 21228480.

The previous prime is 55203769. The next prime is 55203821. The reversal of 55203778 is 87730255.

55203778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

55203778 is a nontrivial binomial coefficient, being equal to C(10508, 2).

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 698743 + ... + 698821.

It is an arithmetic number, because the mean of its divisors is an integer number (1641600).

Almost surely, 2^55203778 is an apocalyptic number.

55203778 is the 10507-th triangular number and also the 5254-th hexagonal number.

55203778 is the 3503-rd centered nonagonal number.

55203778 is a deficient number, since it is larger than the sum of its proper divisors (49858622).

55203778 is a wasteful number, since it uses less digits than its factorization.

55203778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 215.

The product of its (nonzero) digits is 58800, while the sum is 37.

The square root of 55203778 is about 7429.9244949057. The cubic root of 55203778 is about 380.7643387576.

The spelling of 55203778 in words is "fifty-five million, two hundred three thousand, seven hundred seventy-eight".