51849980 has 96 divisors (see below), whose sum is σ = 138485760. Its totient is φ = 15863040.

The previous prime is 51849971. The next prime is 51849989. The reversal of 51849980 is 8994815.

It is an interprime number because it is at equal distance from previous prime (51849971) and next prime (51849989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51849989) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 55961 + ... + 56879.

It is an arithmetic number, because the mean of its divisors is an integer number (1442560).

Almost surely, 2^51849980 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 51849980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (69242880).

51849980 is an abundant number, since it is smaller than the sum of its proper divisors (86635780).

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

51849980 is a wasteful number, since it uses less digits than its factorization.

51849980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 979 (or 977 counting only the distinct ones).

The product of its (nonzero) digits is 103680, while the sum is 44.

The square root of 51849980 is about 7200.6930222028. The cubic root of 51849980 is about 372.8918267875.

The spelling of 51849980 in words is "fifty-one million, eight hundred forty-nine thousand, nine hundred eighty".