55640623 has 8 divisors (see below), whose sum is σ = 56210400. Its totient is φ = 55073760.

The previous prime is 55640617. The next prime is 55640653. The reversal of 55640623 is 32604655.

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

It is a cyclic number.

It is not a de Polignac number, because 55640623 - 2⁵ = 55640591 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55640603) 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 7 ways as a sum of consecutive naturals, for example, 62286 + ... + 63172.

It is an arithmetic number, because the mean of its divisors is an integer number (7026300).

Almost surely, 2^55640623 is an apocalyptic number.

55640623 is a deficient number, since it is larger than the sum of its proper divisors (569777).

55640623 is a wasteful number, since it uses less digits than its factorization.

55640623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1457.

The product of its (nonzero) digits is 21600, while the sum is 31.

The square root of 55640623 is about 7459.2642398564. The cubic root of 55640623 is about 381.7660706951.

The spelling of 55640623 in words is "fifty-five million, six hundred forty thousand, six hundred twenty-three".