55640225 has 12 divisors (see below), whose sum is σ = 69412224. Its totient is φ = 44242320.

The previous prime is 55640209. The next prime is 55640251. The reversal of 55640225 is 52204655.

It is not a de Polignac number, because 55640225 - 2⁴ = 55640209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2489 + ... + 10838.

It is an arithmetic number, because the mean of its divisors is an integer number (5784352).

Almost surely, 2^55640225 is an apocalyptic number.

It is an amenable number.

55640225 is a deficient number, since it is larger than the sum of its proper divisors (13771999).

55640225 is a wasteful number, since it uses less digits than its factorization.

55640225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13504 (or 13499 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 29.

The square root of 55640225 is about 7459.2375615742. The cubic root of 55640225 is about 381.7651604294.

The spelling of 55640225 in words is "fifty-five million, six hundred forty thousand, two hundred twenty-five".