51051680 has 72 divisors (see below), whose sum is σ = 128643228. Its totient is φ = 19079168.

The previous prime is 51051677. The next prime is 51051691. The reversal of 51051680 is 8615015.

It can be written as a sum of positive squares in 6 ways, for example, as 33779344 + 17272336 = 5812^2 + 4156^2 .

It is a hoax number, since the sum of its digits (26) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 372572 + ... + 372708.

Almost surely, 2^51051680 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 51051680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64321614).

51051680 is an abundant number, since it is smaller than the sum of its proper divisors (77591548).

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

51051680 is a wasteful number, since it uses less digits than its factorization.

51051680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306 (or 161 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 26.

The square root of 51051680 is about 7145.0458361021. The cubic root of 51051680 is about 370.9681971562.

Adding to 51051680 its reverse (8615015), we get a palindrome (59666695).

The spelling of 51051680 in words is "fifty-one million, fifty-one thousand, six hundred eighty".