51980000 has 120 divisors (see below), whose sum is σ = 134619408. Its totient is φ = 19712000.

The previous prime is 51979951. The next prime is 51980009. The reversal of 51980000 is 8915.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51980009) 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 19 ways as a sum of consecutive naturals, for example, 459944 + ... + 460056.

Almost surely, 2^51980000 is an apocalyptic number.

51980000 is a gapful number since it is divisible by the number (50) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51980000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67309704).

51980000 is an abundant number, since it is smaller than the sum of its proper divisors (82639408).

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

51980000 is a wasteful number, since it uses less digits than its factorization.

51980000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166 (or 143 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 23.

The square root of 51980000 is about 7209.7156670704. The cubic root of 51980000 is about 373.2032568383.

Adding to 51980000 its reverse (8915), we get a palindrome (51988915).

The spelling of 51980000 in words is "fifty-one million, nine hundred eighty thousand".