55788215 has 12 divisors (see below), whose sum is σ = 77876136. Its totient is φ = 38254608.

The previous prime is 55788211. The next prime is 55788263. The reversal of 55788215 is 51288755.

It is not a de Polignac number, because 55788215 - 2² = 55788211 is a prime.

It is a super-2 number, since 2×55788215² = 6224649865772450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (55788211) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 113609 + ... + 114098.

It is an arithmetic number, because the mean of its divisors is an integer number (6489678).

Almost surely, 2^55788215 is an apocalyptic number.

55788215 is a deficient number, since it is larger than the sum of its proper divisors (22087921).

55788215 is a wasteful number, since it uses less digits than its factorization.

55788215 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227726 (or 227719 counting only the distinct ones).

The product of its digits is 112000, while the sum is 41.

The square root of 55788215 is about 7469.1508888226. The cubic root of 55788215 is about 382.1033295027.

The spelling of 55788215 in words is "fifty-five million, seven hundred eighty-eight thousand, two hundred fifteen".