55147218 has 32 divisors (see below), whose sum is σ = 133467264. Its totient is φ = 14829312.

The previous prime is 55147217. The next prime is 55147219. The reversal of 55147218 is 81274155.

It is an interprime number because it is at equal distance from previous prime (55147217) and next prime (55147219).

It is a super-3 number, since 3×55147218³ (a number of 24 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (55147217) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 37905 + ... + 39332.

It is an arithmetic number, because the mean of its divisors is an integer number (4170852).

Almost surely, 2^55147218 is an apocalyptic number.

55147218 is an abundant number, since it is smaller than the sum of its proper divisors (78320046).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55147218 is a wasteful number, since it uses less digits than its factorization.

55147218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77266.

The product of its digits is 11200, while the sum is 33.

The square root of 55147218 is about 7426.1172896743. The cubic root of 55147218 is about 380.6342547247.

The spelling of 55147218 in words is "fifty-five million, one hundred forty-seven thousand, two hundred eighteen".