6464642 has 4 divisors (see below), whose sum is σ = 9696966. Its totient is φ = 3232320.

The previous prime is 6464639. The next prime is 6464687. The reversal of 6464642 is 2464646.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 6105841 + 358801 = 2471^2 + 599^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6464599 and 6464608.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1616159 + ... + 1616162.

Almost surely, 2^6464642 is an apocalyptic number.

6464642 is a deficient number, since it is larger than the sum of its proper divisors (3232324).

6464642 is a wasteful number, since it uses less digits than its factorization.

6464642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3232323.

The product of its digits is 27648, while the sum is 32.

The square root of 6464642 is about 2542.5660266746. The cubic root of 6464642 is about 186.2865471874.

The spelling of 6464642 in words is "six million, four hundred sixty-four thousand, six hundred forty-two".