647423520 has 96 divisors (see below), whose sum is σ = 2074040640. Its totient is φ = 169712640.

The previous prime is 647423519. The next prime is 647423603. The reversal of 647423520 is 25324746.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16890 + ... + 39750.

It is an arithmetic number, because the mean of its divisors is an integer number (21604590).

Almost surely, 2^647423520 is an apocalyptic number.

647423520 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 647423520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1037020320).

647423520 is an abundant number, since it is smaller than the sum of its proper divisors (1426617120).

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

647423520 is a wasteful number, since it uses less digits than its factorization.

647423520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22938 (or 22930 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 33.

The square root of 647423520 is about 25444.5184666560. The cubic root of 647423520 is about 865.0930524596.

The spelling of 647423520 in words is "six hundred forty-seven million, four hundred twenty-three thousand, five hundred twenty".