51651660 has 24 divisors (see below), whose sum is σ = 144624816. Its totient is φ = 13773760.

The previous prime is 51651659. The next prime is 51651679. The reversal of 51651660 is 6615615.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 430371 + ... + 430490.

It is an arithmetic number, because the mean of its divisors is an integer number (6026034).

Almost surely, 2^51651660 is an apocalyptic number.

It is an amenable number.

51651660 is an abundant number, since it is smaller than the sum of its proper divisors (92973156).

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

51651660 is a wasteful number, since it uses less digits than its factorization.

51651660 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 860873 (or 860871 counting only the distinct ones).

The product of its (nonzero) digits is 5400, while the sum is 30.

The square root of 51651660 is about 7186.9089322184. The cubic root of 51651660 is about 372.4157970719.

The spelling of 51651660 in words is "fifty-one million, six hundred fifty-one thousand, six hundred sixty".