51565072 has 40 divisors (see below), whose sum is σ = 108289944. Its totient is φ = 23645184.

The previous prime is 51565061. The next prime is 51565081. The reversal of 51565072 is 27056515.

It can be written as a sum of positive squares in 4 ways, for example, as 17272336 + 34292736 = 4156^2 + 5856^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35268 + ... + 36700.

Almost surely, 2^51565072 is an apocalyptic number.

51565072 is a gapful number since it is divisible by the number (52) 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 51565072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54144972).

51565072 is an abundant number, since it is smaller than the sum of its proper divisors (56724872).

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

51565072 is a wasteful number, since it uses less digits than its factorization.

51565072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1627 (or 1621 counting only the distinct ones).

The product of its (nonzero) digits is 10500, while the sum is 31.

The square root of 51565072 is about 7180.8823970317. The cubic root of 51565072 is about 372.2075767544.

The spelling of 51565072 in words is "fifty-one million, five hundred sixty-five thousand, seventy-two".