51344540 has 24 divisors (see below), whose sum is σ = 116118240. Its totient is φ = 18957888.

The previous prime is 51344459. The next prime is 51344551. The reversal of 51344540 is 4544315.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is a congruent number.

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, 98480 + ... + 98999.

It is an arithmetic number, because the mean of its divisors is an integer number (4838260).

Almost surely, 2^51344540 is an apocalyptic number.

It is an amenable number.

51344540 is an abundant number, since it is smaller than the sum of its proper divisors (64773700).

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

51344540 is a wasteful number, since it uses less digits than its factorization.

51344540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197501 (or 197499 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 26.

The square root of 51344540 is about 7165.5104493679. The cubic root of 51344540 is about 371.6762029991.

Adding to 51344540 its reverse (4544315), we get a palindrome (55888855).

The spelling of 51344540 in words is "fifty-one million, three hundred forty-four thousand, five hundred forty".