55203978 has 8 divisors (see below), whose sum is σ = 110407968. Its totient is φ = 18401324.

The previous prime is 55203971. The next prime is 55203997. The reversal of 55203978 is 87930255.

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

55203978 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (55203971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4600326 + ... + 4600337.

It is an arithmetic number, because the mean of its divisors is an integer number (13800996).

Almost surely, 2^55203978 is an apocalyptic number.

55203978 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

55203978 is a wasteful number, since it uses less digits than its factorization.

55203978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9200668.

The product of its (nonzero) digits is 75600, while the sum is 39.

The square root of 55203978 is about 7429.9379539805. The cubic root of 55203978 is about 380.7647985859.

The spelling of 55203978 in words is "fifty-five million, two hundred three thousand, nine hundred seventy-eight".