51356540 has 12 divisors (see below), whose sum is σ = 107848776. Its totient is φ = 20542608.

The previous prime is 51356537. The next prime is 51356551. The reversal of 51356540 is 4565315.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1283894 + ... + 1283933.

It is an arithmetic number, because the mean of its divisors is an integer number (8987398).

Almost surely, 2^51356540 is an apocalyptic number.

It is an amenable number.

51356540 is an abundant number, since it is smaller than the sum of its proper divisors (56492236).

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

51356540 is a wasteful number, since it uses less digits than its factorization.

51356540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2567836 (or 2567834 counting only the distinct ones).

The product of its (nonzero) digits is 9000, while the sum is 29.

The square root of 51356540 is about 7166.3477448419. The cubic root of 51356540 is about 371.7051562044.

The spelling of 51356540 in words is "fifty-one million, three hundred fifty-six thousand, five hundred forty".