647736540 has 48 divisors (see below), whose sum is σ = 1978542720. Its totient is φ = 157026880.

The previous prime is 647736493. The next prime is 647736553. The reversal of 647736540 is 45637746.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 647736492 and 647736501.

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, 490050 + ... + 491369.

It is an arithmetic number, because the mean of its divisors is an integer number (41219640).

Almost surely, 2^647736540 is an apocalyptic number.

647736540 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

647736540 is an abundant number, since it is smaller than the sum of its proper divisors (1330806180).

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

647736540 is a wasteful number, since it uses less digits than its factorization.

647736540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 981442 (or 981440 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 42.

The square root of 647736540 is about 25450.6687534925. The cubic root of 647736540 is about 865.2324500303.

The spelling of 647736540 in words is "six hundred forty-seven million, seven hundred thirty-six thousand, five hundred forty".