51812736 has 64 divisors (see below), whose sum is σ = 145741680. Its totient is φ = 16252928.

The previous prime is 51812731. The next prime is 51812741. The reversal of 51812736 is 63721815.

It is an interprime number because it is at equal distance from previous prime (51812731) and next prime (51812741).

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×51812736² = 5369119223611392, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 51812697 and 51812706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51812731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2560 + ... + 10496.

Almost surely, 2^51812736 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 51812736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72870840).

51812736 is an abundant number, since it is smaller than the sum of its proper divisors (93928944).

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

51812736 is a wasteful number, since it uses less digits than its factorization.

51812736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7971 (or 7959 counting only the distinct ones).

The product of its digits is 10080, while the sum is 33.

The square root of 51812736 is about 7198.1064176629. The cubic root of 51812736 is about 372.8025222864.

The spelling of 51812736 in words is "fifty-one million, eight hundred twelve thousand, seven hundred thirty-six".