51631776 has 96 divisors (see below), whose sum is σ = 172126080. Its totient is φ = 14750208.

The previous prime is 51631763. The next prime is 51631781. The reversal of 51631776 is 67713615.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 51631776.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1780 + ... + 10316.

It is an arithmetic number, because the mean of its divisors is an integer number (1792980).

Almost surely, 2^51631776 is an apocalyptic number.

51631776 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 51631776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (86063040).

51631776 is an abundant number, since it is smaller than the sum of its proper divisors (120494304).

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

51631776 is a wasteful number, since it uses less digits than its factorization.

51631776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8563 (or 8549 counting only the distinct ones).

The product of its digits is 26460, while the sum is 36.

The square root of 51631776 is about 7185.5254505151. The cubic root of 51631776 is about 372.3680021179.

The spelling of 51631776 in words is "fifty-one million, six hundred thirty-one thousand, seven hundred seventy-six".