55442215 has 8 divisors (see below), whose sum is σ = 66661488. Its totient is φ = 44266560.

The previous prime is 55442203. The next prime is 55442239. The reversal of 55442215 is 51224455.

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

It is not a de Polignac number, because 55442215 - 2¹¹ = 55440167 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8037 + ... + 13246.

It is an arithmetic number, because the mean of its divisors is an integer number (8332686).

Almost surely, 2^55442215 is an apocalyptic number.

55442215 is a deficient number, since it is larger than the sum of its proper divisors (11219273).

55442215 is a wasteful number, since it uses less digits than its factorization.

55442215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21809.

The product of its digits is 8000, while the sum is 28.

The square root of 55442215 is about 7445.9529275976. The cubic root of 55442215 is about 381.3117524267.

It can be divided in two parts, 55 and 442215, that multiplied together give a triangular number (24321825 = T₆₉₇₄).

The spelling of 55442215 in words is "fifty-five million, four hundred forty-two thousand, two hundred fifteen".