642464 has 24 divisors (see below), whose sum is σ = 1340388. Its totient is φ = 302080.

The previous prime is 642457. The next prime is 642487. The reversal of 642464 is 464246.

It can be written as a sum of positive squares in 2 ways, for example, as 547600 + 94864 = 740^2 + 308^2 .

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 642464.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47 + ... + 1134.

2⁶⁴²⁴⁶⁴ is an apocalyptic number.

It is an amenable number.

642464 is an abundant number, since it is smaller than the sum of its proper divisors (697924).

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

642464 is a wasteful number, since it uses less digits than its factorization.

642464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1200 counting only the distinct ones).

The product of its digits is 4608, while the sum is 26.

The square root of 642464 is about 801.5385205965. The cubic root of 642464 is about 86.2878402888.

The spelling of 642464 in words is "six hundred forty-two thousand, four hundred sixty-four".