55220506 has 8 divisors (see below), whose sum is σ = 90360864. Its totient is φ = 25100220.

The previous prime is 55220491. The next prime is 55220509. The reversal of 55220506 is 60502255.

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

It is not an unprimeable number, because it can be changed into a prime (55220509) 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, 1254990 + ... + 1255033.

It is an arithmetic number, because the mean of its divisors is an integer number (11295108).

Almost surely, 2^55220506 is an apocalyptic number.

55220506 is a deficient number, since it is larger than the sum of its proper divisors (35140358).

55220506 is a wasteful number, since it uses less digits than its factorization.

55220506 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2510036.

The product of its (nonzero) digits is 3000, while the sum is 25.

The square root of 55220506 is about 7431.0501276737. The cubic root of 55220506 is about 380.8027949578.

The spelling of 55220506 in words is "fifty-five million, two hundred twenty thousand, five hundred six".