51553540 has 24 divisors (see below), whose sum is σ = 110039832. Its totient is φ = 20282880.

The previous prime is 51553507. The next prime is 51553547. The reversal of 51553540 is 4535515.

It can be written as a sum of positive squares in 4 ways, for example, as 58564 + 51494976 = 242^2 + 7176^2 .

It is a junction number, because it is equal to n+sod(n) for n = 51553499 and 51553508.

It is not an unprimeable number, because it can be changed into a prime (51553547) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19909 + ... + 22348.

It is an arithmetic number, because the mean of its divisors is an integer number (4584993).

Almost surely, 2^51553540 is an apocalyptic number.

It is an amenable number.

51553540 is an abundant number, since it is smaller than the sum of its proper divisors (58486292).

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

51553540 is a wasteful number, since it uses less digits than its factorization.

51553540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42327 (or 42325 counting only the distinct ones).

The product of its (nonzero) digits is 7500, while the sum is 28.

The square root of 51553540 is about 7180.0793867478. The cubic root of 51553540 is about 372.1798278821.

The spelling of 51553540 in words is "fifty-one million, five hundred fifty-three thousand, five hundred forty".