51651340 has 24 divisors (see below), whose sum is σ = 116812080. Its totient is φ = 19071168.

The previous prime is 51651337. The next prime is 51651377. The reversal of 51651340 is 4315615.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 99070 + ... + 99589.

It is an arithmetic number, because the mean of its divisors is an integer number (4867170).

Almost surely, 2^51651340 is an apocalyptic number.

It is an amenable number.

51651340 is an abundant number, since it is smaller than the sum of its proper divisors (65160740).

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

51651340 is a wasteful number, since it uses less digits than its factorization.

51651340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198681 (or 198679 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 25.

The square root of 51651340 is about 7186.8866694835. The cubic root of 51651340 is about 372.4150279885.

Adding to 51651340 its reverse (4315615), we get a palindrome (55966955).

The spelling of 51651340 in words is "fifty-one million, six hundred fifty-one thousand, three hundred forty".