51770220 has 48 divisors (see below), whose sum is σ = 149960160. Its totient is φ = 13328896.

The previous prime is 51770209. The next prime is 51770227. The reversal of 51770220 is 2207715.

It is not an unprimeable number, because it can be changed into a prime (51770227) 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, 13137 + ... + 16616.

It is an arithmetic number, because the mean of its divisors is an integer number (3124170).

Almost surely, 2^51770220 is an apocalyptic number.

It is an amenable number.

51770220 is an abundant number, since it is smaller than the sum of its proper divisors (98189940).

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

51770220 is a wasteful number, since it uses less digits than its factorization.

51770220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29794 (or 29792 counting only the distinct ones).

The product of its (nonzero) digits is 980, while the sum is 24.

The square root of 51770220 is about 7195.1525348668. The cubic root of 51770220 is about 372.7005241382.

Adding to 51770220 its reverse (2207715), we get a palindrome (53977935).

The spelling of 51770220 in words is "fifty-one million, seven hundred seventy thousand, two hundred twenty".