51989578 has 8 divisors (see below), whose sum is σ = 79052868. Its totient is φ = 25638624.

The previous prime is 51989563. The next prime is 51989579. The reversal of 51989578 is 87598915.

It can be written as a sum of positive squares in 2 ways, for example, as 51509329 + 480249 = 7177^2 + 693^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (51989579) 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 3 ways as a sum of consecutive naturals, for example, 177901 + ... + 178192.

Almost surely, 2^51989578 is an apocalyptic number.

51989578 is a deficient number, since it is larger than the sum of its proper divisors (27063290).

51989578 is a wasteful number, since it uses less digits than its factorization.

51989578 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 356168.

The product of its digits is 907200, while the sum is 52.

The square root of 51989578 is about 7210.3798790355. The cubic root of 51989578 is about 373.2261779699.

The spelling of 51989578 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred seventy-eight".