51931776 has 128 divisors (see below), whose sum is σ = 151482240. Its totient is φ = 15667200.

The previous prime is 51931751. The next prime is 51931777. The reversal of 51931776 is 67713915.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (51931777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 504141 + ... + 504243.

It is an arithmetic number, because the mean of its divisors is an integer number (1183455).

Almost surely, 2^51931776 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 51931776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (75741120).

51931776 is an abundant number, since it is smaller than the sum of its proper divisors (99550464).

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

51931776 is a wasteful number, since it uses less digits than its factorization.

51931776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234 (or 222 counting only the distinct ones).

The product of its digits is 39690, while the sum is 39.

The square root of 51931776 is about 7206.3705150374. The cubic root of 51931776 is about 373.0878090869.

The spelling of 51931776 in words is "fifty-one million, nine hundred thirty-one thousand, seven hundred seventy-six".