645670464 has 112 divisors (see below), whose sum is σ = 1806854400. Its totient is φ = 202922496.

The previous prime is 645670463. The next prime is 645670549. The reversal of 645670464 is 464076546.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (645670463) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1382359 + ... + 1382825.

Almost surely, 2^645670464 is an apocalyptic number.

645670464 is a gapful number since it is divisible by the number (64) 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 645670464, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (903427200).

645670464 is an abundant number, since it is smaller than the sum of its proper divisors (1161183936).

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

645670464 is a wasteful number, since it uses less digits than its factorization.

645670464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 880 (or 870 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 42.

The square root of 645670464 is about 25410.0465170767. The cubic root of 645670464 is about 864.3115303200.

The spelling of 645670464 in words is "six hundred forty-five million, six hundred seventy thousand, four hundred sixty-four".