51299340 has 48 divisors (see below), whose sum is σ = 144695040. Its totient is φ = 13579200.

The previous prime is 51299329. The next prime is 51299341. The reversal of 51299340 is 4399215.

It is not an unprimeable number, because it can be changed into a prime (51299341) 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, 5265 + ... + 11415.

It is an arithmetic number, because the mean of its divisors is an integer number (3014480).

Almost surely, 2^51299340 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 51299340, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72347520).

51299340 is an abundant number, since it is smaller than the sum of its proper divisors (93395700).

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

51299340 is a wasteful number, since it uses less digits than its factorization.

51299340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6302 (or 6300 counting only the distinct ones).

The product of its (nonzero) digits is 9720, while the sum is 33.

The square root of 51299340 is about 7162.3557577099. The cubic root of 51299340 is about 371.5671054102.

The spelling of 51299340 in words is "fifty-one million, two hundred ninety-nine thousand, three hundred forty".