51975000 has 384 divisors, whose sum is σ = 224985600. Its totient is φ = 10800000.

The previous prime is 51974999. The next prime is 51975031. The reversal of 51975000 is 57915.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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 95 ways as a sum of consecutive naturals, for example, 4724995 + ... + 4725005.

It is an arithmetic number, because the mean of its divisors is an integer number (585900).

Almost surely, 2^51975000 is an apocalyptic number.

51975000 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 51975000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (112492800).

51975000 is an abundant number, since it is smaller than the sum of its proper divisors (173010600).

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

51975000 is a wasteful number, since it uses less digits than its factorization.

51975000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58 (or 28 counting only the distinct ones).

The product of its (nonzero) digits is 1575, while the sum is 27.

The square root of 51975000 is about 7209.3689044187. The cubic root of 51975000 is about 373.1912902094.

The spelling of 51975000 in words is "fifty-one million, nine hundred seventy-five thousand".