464640561 has 48 divisors (see below), whose sum is σ = 859417728. Its totient is φ = 234835200.

The previous prime is 464640551. The next prime is 464640587. The reversal of 464640561 is 165046464.

464640561 is a `hidden beast` number, since 4 + 6 + 4 + 640 + 5 + 6 + 1 = 666.

It is not a de Polignac number, because 464640561 - 2⁷ = 464640433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (464640521) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 16581 + ... + 34701.

It is an arithmetic number, because the mean of its divisors is an integer number (17904536).

Almost surely, 2^464640561 is an apocalyptic number.

It is an amenable number.

464640561 is a deficient number, since it is larger than the sum of its proper divisors (394777167).

464640561 is a wasteful number, since it uses less digits than its factorization.

464640561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18182 (or 18179 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 464640561 is about 21555.5227494023. The cubic root of 464640561 is about 774.5314189979.

The spelling of 464640561 in words is "four hundred sixty-four million, six hundred forty thousand, five hundred sixty-one".