51380736 has 80 divisors (see below), whose sum is σ = 149374368. Its totient is φ = 15564800.

The previous prime is 51380717. The next prime is 51380737. The reversal of 51380736 is 63708315.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a junction number, because it is equal to n+sod(n) for n = 51380697 and 51380706.

It is not an unprimeable number, because it can be changed into a prime (51380737) 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, 15376 + ... + 18416.

Almost surely, 2^51380736 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 51380736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74687184).

51380736 is an abundant number, since it is smaller than the sum of its proper divisors (97993632).

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

51380736 is a wasteful number, since it uses less digits than its factorization.

51380736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3073 (or 3057 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 51380736 is about 7168.0357141967. The cubic root of 51380736 is about 371.7635218049.

The spelling of 51380736 in words is "fifty-one million, three hundred eighty thousand, seven hundred thirty-six".