646540510 has 48 divisors (see below), whose sum is σ = 1461948768. Its totient is φ = 201516480.

The previous prime is 646540483. The next prime is 646540513. The reversal of 646540510 is 15045646.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646540513) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 29697 + ... + 46636.

It is an arithmetic number, because the mean of its divisors is an integer number (30457266).

Almost surely, 2^646540510 is an apocalyptic number.

646540510 is an abundant number, since it is smaller than the sum of its proper divisors (815408258).

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

646540510 is a wasteful number, since it uses less digits than its factorization.

646540510 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76369 (or 76358 counting only the distinct ones).

The product of its (nonzero) digits is 14400, while the sum is 31.

The square root of 646540510 is about 25427.1608717922. The cubic root of 646540510 is about 864.6995782552.

The spelling of 646540510 in words is "six hundred forty-six million, five hundred forty thousand, five hundred ten".