647387520 has 256 divisors, whose sum is σ = 2285599680. Its totient is φ = 154828800.

The previous prime is 647387497. The next prime is 647387549. The reversal of 647387520 is 25783746.

It is a super-2 number, since 2×647387520² = 838221202103500800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 923170 + ... + 923870.

Almost surely, 2^647387520 is an apocalyptic number.

647387520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 647387520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1142799840).

647387520 is an abundant number, since it is smaller than the sum of its proper divisors (1638212160).

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

647387520 is a wasteful number, since it uses less digits than its factorization.

647387520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 773 (or 761 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 42.

The square root of 647387520 is about 25443.8110352989. The cubic root of 647387520 is about 865.0770176559.

The spelling of 647387520 in words is "six hundred forty-seven million, three hundred eighty-seven thousand, five hundred twenty".