51662220 has 24 divisors (see below), whose sum is σ = 144654384. Its totient is φ = 13776576.

The previous prime is 51662183. The next prime is 51662231. The reversal of 51662220 is 2226615.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430459 + ... + 430578.

It is an arithmetic number, because the mean of its divisors is an integer number (6027266).

Almost surely, 2^51662220 is an apocalyptic number.

It is an amenable number.

51662220 is an abundant number, since it is smaller than the sum of its proper divisors (92992164).

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

51662220 is a wasteful number, since it uses less digits than its factorization.

51662220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 861049 (or 861047 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 24.

The square root of 51662220 is about 7187.6435637836. The cubic root of 51662220 is about 372.4411750419.

Adding to 51662220 its reverse (2226615), we get a palindrome (53888835).

The spelling of 51662220 in words is "fifty-one million, six hundred sixty-two thousand, two hundred twenty".