51275820 has 48 divisors (see below), whose sum is σ = 143942400. Its totient is φ = 13638336.

The previous prime is 51275801. The next prime is 51275827. The reversal of 51275820 is 2857215.

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

It is not an unprimeable number, because it can be changed into a prime (51275827) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 29331 + ... + 31029.

It is an arithmetic number, because the mean of its divisors is an integer number (2998800).

Almost surely, 2^51275820 is an apocalyptic number.

It is an amenable number.

51275820 is an abundant number, since it is smaller than the sum of its proper divisors (92666580).

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

51275820 is a wasteful number, since it uses less digits than its factorization.

51275820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2214 (or 2212 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 30.

The square root of 51275820 is about 7160.7136515853. The cubic root of 51275820 is about 371.5103106947.

The spelling of 51275820 in words is "fifty-one million, two hundred seventy-five thousand, eight hundred twenty".