51646980 has 144 divisors (see below), whose sum is σ = 183629376. Its totient is φ = 10725120.

The previous prime is 51646951. The next prime is 51647009. The reversal of 51646980 is 8964615.

It is an interprime number because it is at equal distance from previous prime (51646951) and next prime (51647009).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 31542 + ... + 33138.

It is an arithmetic number, because the mean of its divisors is an integer number (1275204).

Almost surely, 2^51646980 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 51646980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91814688).

51646980 is an abundant number, since it is smaller than the sum of its proper divisors (131982396).

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

51646980 is a wasteful number, since it uses less digits than its factorization.

51646980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634 (or 1625 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 39.

The square root of 51646980 is about 7186.5833328502. The cubic root of 51646980 is about 372.4045489108.

The spelling of 51646980 in words is "fifty-one million, six hundred forty-six thousand, nine hundred eighty".