646423520 has 48 divisors (see below), whose sum is σ = 1542956688. Its totient is φ = 255897600.

The previous prime is 646423517. The next prime is 646423573. The reversal of 646423520 is 25324646.

646423520 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5306 + ... + 36345.

It is an arithmetic number, because the mean of its divisors is an integer number (32144931).

Almost surely, 2^646423520 is an apocalyptic number.

It is an amenable number.

646423520 is an abundant number, since it is smaller than the sum of its proper divisors (896533168).

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

646423520 is a wasteful number, since it uses less digits than its factorization.

646423520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41763 (or 41755 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 32.

The square root of 646423520 is about 25424.8602749356. The cubic root of 646423520 is about 864.6474199839.

The spelling of 646423520 in words is "six hundred forty-six million, four hundred twenty-three thousand, five hundred twenty".