51820984 has 8 divisors (see below), whose sum is σ = 97164360. Its totient is φ = 25910488.

The previous prime is 51820973. The next prime is 51820987. The reversal of 51820984 is 48902815.

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51820987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3238804 + ... + 3238819.

It is an arithmetic number, because the mean of its divisors is an integer number (12145545).

Almost surely, 2^51820984 is an apocalyptic number.

It is an amenable number.

51820984 is a deficient number, since it is larger than the sum of its proper divisors (45343376).

51820984 is a wasteful number, since it uses less digits than its factorization.

51820984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6477629 (or 6477625 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 37.

The square root of 51820984 is about 7198.6793233204. The cubic root of 51820984 is about 372.8223032148.

The spelling of 51820984 in words is "fifty-one million, eight hundred twenty thousand, nine hundred eighty-four".