51275220 has 24 divisors (see below), whose sum is σ = 143570784. Its totient is φ = 13673376.

The previous prime is 51275207. The next prime is 51275239. The reversal of 51275220 is 2257215.

51275220 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 427234 + ... + 427353.

It is an arithmetic number, because the mean of its divisors is an integer number (5982116).

Almost surely, 2^51275220 is an apocalyptic number.

It is an amenable number.

51275220 is an abundant number, since it is smaller than the sum of its proper divisors (92295564).

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

51275220 is a wasteful number, since it uses less digits than its factorization.

51275220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 854599 (or 854597 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 24.

The square root of 51275220 is about 7160.6717561972. The cubic root of 51275220 is about 371.5088616227.

The spelling of 51275220 in words is "fifty-one million, two hundred seventy-five thousand, two hundred twenty".