51032340 has 72 divisors (see below), whose sum is σ = 155380680. Its totient is φ = 13557504.

The previous prime is 51032339. The next prime is 51032381. The reversal of 51032340 is 4323015.

It can be written as a sum of positive squares in 4 ways, for example, as 3090564 + 47941776 = 1758^2 + 6924^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 91342 + ... + 91898.

It is an arithmetic number, because the mean of its divisors is an integer number (2158065).

Almost surely, 2^51032340 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 51032340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77690340).

51032340 is an abundant number, since it is smaller than the sum of its proper divisors (104348340).

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

51032340 is a wasteful number, since it uses less digits than its factorization.

51032340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1081 (or 1076 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 18.

The square root of 51032340 is about 7143.6923226018. The cubic root of 51032340 is about 370.9213463891.

Adding to 51032340 its reverse (4323015), we get a palindrome (55355355).

The spelling of 51032340 in words is "fifty-one million, thirty-two thousand, three hundred forty".