51179720 has 16 divisors (see below), whose sum is σ = 115154460. Its totient is φ = 20471872.

The previous prime is 51179719. The next prime is 51179743. The reversal of 51179720 is 2797115.

It can be written as a sum of positive squares in 2 ways, for example, as 51179716 + 4 = 7154^2 + 2^2 .

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 3 ways as a sum of consecutive naturals, for example, 639707 + ... + 639786.

Almost surely, 2^51179720 is an apocalyptic number.

It is an amenable number.

51179720 is an abundant number, since it is smaller than the sum of its proper divisors (63974740).

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

51179720 is a wasteful number, since it uses less digits than its factorization.

51179720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1279504 (or 1279500 counting only the distinct ones).

The product of its (nonzero) digits is 4410, while the sum is 32.

The square root of 51179720 is about 7154.0002795639. Note that the first 3 decimals coincide. The cubic root of 51179720 is about 371.2780734325.

The spelling of 51179720 in words is "fifty-one million, one hundred seventy-nine thousand, seven hundred twenty".