51141640 has 64 divisors (see below), whose sum is σ = 128252160. Its totient is φ = 18193920.

The previous prime is 51141631. The next prime is 51141641. The reversal of 51141640 is 4614115.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (51141641) 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, 19444 + ... + 21916.

It is an arithmetic number, because the mean of its divisors is an integer number (2003940).

Almost surely, 2^51141640 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 51141640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64126080).

51141640 is an abundant number, since it is smaller than the sum of its proper divisors (77110520).

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

51141640 is a wasteful number, since it uses less digits than its factorization.

51141640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2542 (or 2538 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 22.

The square root of 51141640 is about 7151.3383362836. The cubic root of 51141640 is about 371.1859680895.

Adding to 51141640 its reverse (4614115), we get a palindrome (55755755).

The spelling of 51141640 in words is "fifty-one million, one hundred forty-one thousand, six hundred forty".