55009904 has 20 divisors (see below), whose sum is σ = 107292240. Its totient is φ = 27321600.

The previous prime is 55009901. The next prime is 55009939. The reversal of 55009904 is 40990055.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55009901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8969 + ... + 13800.

It is an arithmetic number, because the mean of its divisors is an integer number (5364612).

Almost surely, 2^55009904 is an apocalyptic number.

It is an amenable number.

55009904 is a deficient number, since it is larger than the sum of its proper divisors (52282336).

55009904 is a wasteful number, since it uses less digits than its factorization.

55009904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22928 (or 22922 counting only the distinct ones).

The product of its (nonzero) digits is 8100, while the sum is 32.

The square root of 55009904 is about 7416.8661845823. The cubic root of 55009904 is about 380.3180716402.

Adding to 55009904 its reverse (40990055), we get a palindrome (95999959).

The spelling of 55009904 in words is "fifty-five million, nine thousand, nine hundred four".