55215404 has 6 divisors (see below), whose sum is σ = 96626964. Its totient is φ = 27607700.

The previous prime is 55215389. The next prime is 55215421. The reversal of 55215404 is 40451255.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 6901922 + ... + 6901929.

It is an arithmetic number, because the mean of its divisors is an integer number (16104494).

Almost surely, 2^55215404 is an apocalyptic number.

It is an amenable number.

55215404 is a deficient number, since it is larger than the sum of its proper divisors (41411560).

55215404 is a wasteful number, since it uses less digits than its factorization.

55215404 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13803855 (or 13803853 counting only the distinct ones).

The product of its (nonzero) digits is 4000, while the sum is 26.

The square root of 55215404 is about 7430.7068304435. The cubic root of 55215404 is about 380.7910667319.

Adding to 55215404 its reverse (40451255), we get a palindrome (95666659).

The spelling of 55215404 in words is "fifty-five million, two hundred fifteen thousand, four hundred four".