645519480 has 64 divisors (see below), whose sum is σ = 1956558240. Its totient is φ = 170360832.

The previous prime is 645519419. The next prime is 645519499. The reversal of 645519480 is 84915546.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16089 + ... + 39368.

Almost surely, 2^645519480 is an apocalyptic number.

645519480 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

645519480 is an abundant number, since it is smaller than the sum of its proper divisors (1311038760).

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

645519480 is a wasteful number, since it uses less digits than its factorization.

645519480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55568 (or 55564 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 42.

The square root of 645519480 is about 25407.0753924965. The cubic root of 645519480 is about 864.2441546784.

The spelling of 645519480 in words is "six hundred forty-five million, five hundred nineteen thousand, four hundred eighty".