647427540 has 48 divisors (see below), whose sum is σ = 1816601472. Its totient is φ = 172285056.

The previous prime is 647427533. The next prime is 647427551. The reversal of 647427540 is 45724746.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 18142 + ... + 40298.

It is an arithmetic number, because the mean of its divisors is an integer number (37845864).

Almost surely, 2^647427540 is an apocalyptic number.

647427540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647427540 is an abundant number, since it is smaller than the sum of its proper divisors (1169173932).

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

647427540 is a wasteful number, since it uses less digits than its factorization.

647427540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22656 (or 22654 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 39.

The square root of 647427540 is about 25444.5974619368. The cubic root of 647427540 is about 865.0948429758.

The spelling of 647427540 in words is "six hundred forty-seven million, four hundred twenty-seven thousand, five hundred forty".