51390336 has 64 divisors (see below), whose sum is σ = 140233680. Its totient is φ = 16662528.

The previous prime is 51390331. The next prime is 51390347. The reversal of 51390336 is 63309315.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51390331) 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, 12400 + ... + 16016.

Almost surely, 2^51390336 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 51390336, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70116840).

51390336 is an abundant number, since it is smaller than the sum of its proper divisors (88843344).

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

51390336 is a wasteful number, since it uses less digits than its factorization.

51390336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3671 (or 3659 counting only the distinct ones).

The product of its (nonzero) digits is 7290, while the sum is 30.

The square root of 51390336 is about 7168.7053224414. The cubic root of 51390336 is about 371.7866738513.

The spelling of 51390336 in words is "fifty-one million, three hundred ninety thousand, three hundred thirty-six".