51972820 has 24 divisors (see below), whose sum is σ = 109283328. Its totient is φ = 20762400.

The previous prime is 51972803. The next prime is 51972821. The reversal of 51972820 is 2827915.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51972821) 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 7 ways as a sum of consecutive naturals, for example, 23565 + ... + 25675.

It is an arithmetic number, because the mean of its divisors is an integer number (4553472).

Almost surely, 2^51972820 is an apocalyptic number.

It is an amenable number.

51972820 is an abundant number, since it is smaller than the sum of its proper divisors (57310508).

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

51972820 is a wasteful number, since it uses less digits than its factorization.

51972820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3351 (or 3349 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 34.

The square root of 51972820 is about 7209.2177106812. The cubic root of 51972820 is about 373.1860725189.

The spelling of 51972820 in words is "fifty-one million, nine hundred seventy-two thousand, eight hundred twenty".