51539020 has 48 divisors (see below), whose sum is σ = 122703840. Its totient is φ = 18026496.

The previous prime is 51538997. The next prime is 51539027. The reversal of 51539020 is 2093515.

It is not an unprimeable number, because it can be changed into a prime (51539027) 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, 277 + ... + 10156.

It is an arithmetic number, because the mean of its divisors is an integer number (2556330).

Almost surely, 2^51539020 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51539020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61351920).

51539020 is an abundant number, since it is smaller than the sum of its proper divisors (71164820).

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

51539020 is a wasteful number, since it uses less digits than its factorization.

51539020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10474 (or 10472 counting only the distinct ones).

The product of its (nonzero) digits is 1350, while the sum is 25.

The square root of 51539020 is about 7179.0681846602. The cubic root of 51539020 is about 372.1448832496.

The spelling of 51539020 in words is "fifty-one million, five hundred thirty-nine thousand, twenty".