51961984 has 64 divisors (see below), whose sum is σ = 107785440. Its totient is φ = 24938496.

The previous prime is 51961967. The next prime is 51961999. The reversal of 51961984 is 48916915.

It is a tau number, because it is divible by the number of its divisors (64).

It is a self number, because there is not a number n which added to its sum of digits gives 51961984.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 626007 + ... + 626089.

Almost surely, 2^51961984 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51961984, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53892720).

51961984 is an abundant number, since it is smaller than the sum of its proper divisors (55823456).

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

51961984 is an equidigital number, since it uses as much as digits as its factorization.

51961984 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 237 (or 225 counting only the distinct ones).

The product of its digits is 77760, while the sum is 43.

The square root of 51961984 is about 7208.4661336515. The cubic root of 51961984 is about 373.1601350811.

The spelling of 51961984 in words is "fifty-one million, nine hundred sixty-one thousand, nine hundred eighty-four".