51989580 has 96 divisors (see below), whose sum is σ = 165580800. Its totient is φ = 13535424.

The previous prime is 51989579. The next prime is 51989593. The reversal of 51989580 is 8598915.

51989580 is a `hidden beast` number, since 519 + 89 + 58 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

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 31 ways as a sum of consecutive naturals, for example, 22101 + ... + 24339.

It is an arithmetic number, because the mean of its divisors is an integer number (1724800).

Almost surely, 2^51989580 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 51989580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82790400).

51989580 is an abundant number, since it is smaller than the sum of its proper divisors (113591220).

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

51989580 is a wasteful number, since it uses less digits than its factorization.

51989580 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2300 (or 2292 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 45.

The square root of 51989580 is about 7210.3800177244. The cubic root of 51989580 is about 373.2261827558.

The spelling of 51989580 in words is "fifty-one million, nine hundred eighty-nine thousand, five hundred eighty".