51989120 has 32 divisors (see below), whose sum is σ = 124288020. Its totient is φ = 20795392.

The previous prime is 51989117. The next prime is 51989123. The reversal of 51989120 is 2198915.

It is an interprime number because it is at equal distance from previous prime (51989117) and next prime (51989123).

It can be written as a sum of positive squares in 2 ways, for example, as 51955264 + 33856 = 7208^2 + 184^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is not an unprimeable number, because it can be changed into a prime (51989123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39977 + ... + 41256.

Almost surely, 2^51989120 is an apocalyptic number.

It is an amenable number.

51989120 is an abundant number, since it is smaller than the sum of its proper divisors (72298900).

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

51989120 is an equidigital number, since it uses as much as digits as its factorization.

51989120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81252 (or 81240 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 51989120 is about 7210.3481191965. The cubic root of 51989120 is about 373.2250819933.

The spelling of 51989120 in words is "fifty-one million, nine hundred eighty-nine thousand, one hundred twenty".