51420312 has 64 divisors (see below), whose sum is σ = 144309600. Its totient is φ = 16963200.

The previous prime is 51420307. The next prime is 51420319. The reversal of 51420312 is 21302415.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (51420319) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20638 + ... + 22994.

Almost surely, 2^51420312 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 51420312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72154800).

51420312 is an abundant number, since it is smaller than the sum of its proper divisors (92889288).

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

51420312 is a wasteful number, since it uses less digits than its factorization.

51420312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2473 (or 2463 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 51420312 is about 7170.7957717397. The cubic root of 51420312 is about 371.8589475640.

Adding to 51420312 its reverse (21302415), we get a palindrome (72722727).

The spelling of 51420312 in words is "fifty-one million, four hundred twenty thousand, three hundred twelve".