645642480 has 160 divisors (see below), whose sum is σ = 2298852864. Its totient is φ = 146838528.

The previous prime is 645642469. The next prime is 645642493. The reversal of 645642480 is 84246546.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 380514 + ... + 382206.

Almost surely, 2^645642480 is an apocalyptic number.

645642480 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 645642480, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1149426432).

645642480 is an abundant number, since it is smaller than the sum of its proper divisors (1653210384).

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

645642480 is a wasteful number, since it uses less digits than its factorization.

645642480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1943 (or 1937 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 39.

The square root of 645642480 is about 25409.4958627675. The cubic root of 645642480 is about 864.2990434325.

The spelling of 645642480 in words is "six hundred forty-five million, six hundred forty-two thousand, four hundred eighty".