648473645 has 4 divisors (see below), whose sum is σ = 778168380. Its totient is φ = 518778912.

The previous prime is 648473641. The next prime is 648473659. The reversal of 648473645 is 546374846.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546374846 = 2 ⋅273187423.

It can be written as a sum of positive squares in 2 ways, for example, as 314388361 + 334085284 = 17731^2 + 18278^2 .

It is a cyclic number.

It is not a de Polignac number, because 648473645 - 2² = 648473641 is a prime.

It is a super-3 number, since 3×648473645³ (a number of 27 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 648473645.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (648473641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 64847360 + ... + 64847369.

It is an arithmetic number, because the mean of its divisors is an integer number (194542095).

Almost surely, 2^648473645 is an apocalyptic number.

It is an amenable number.

648473645 is a deficient number, since it is larger than the sum of its proper divisors (129694735).

648473645 is a wasteful number, since it uses less digits than its factorization.

648473645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129694734.

The product of its digits is 1935360, while the sum is 47.

The square root of 648473645 is about 25465.1456897462. The cubic root of 648473645 is about 865.5605285820.

The spelling of 648473645 in words is "six hundred forty-eight million, four hundred seventy-three thousand, six hundred forty-five".