51549528040 has 24 divisors (see below), whose sum is σ = 115989669090. Its totient is φ = 20619236832.

The previous prime is 51549528029. The next prime is 51549528073. The reversal of 51549528040 is 4082594515.

It can be written as a sum of positive squares in only one way, i.e., 46394575236 + 5154952804 = 215394^2 + 71798^2 .

It is a super-2 number, since 2×51549528040² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1418011 + ... + 1453909.

Almost surely, 2^51549528040 is an apocalyptic number.

It is an amenable number.

51549528040 is an abundant number, since it is smaller than the sum of its proper divisors (64440141050).

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

51549528040 is an frugal number, since it uses more digits than its factorization.

51549528040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71809 (or 35906 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 43.

The spelling of 51549528040 in words is "fifty-one billion, five hundred forty-nine million, five hundred twenty-eight thousand, forty".