649423845 has 64 divisors (see below), whose sum is σ = 1336320000. Its totient is φ = 293087808.

The previous prime is 649423843. The next prime is 649423871. The reversal of 649423845 is 548324946.

It is not a de Polignac number, because 649423845 - 2¹ = 649423843 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 649423845.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649423843) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 70306 + ... + 79004.

It is an arithmetic number, because the mean of its divisors is an integer number (20880000).

Almost surely, 2^649423845 is an apocalyptic number.

It is an amenable number.

649423845 is an abundant number, since it is smaller than the sum of its proper divisors (686896155).

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

649423845 is a wasteful number, since it uses less digits than its factorization.

649423845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8799 (or 8793 counting only the distinct ones).

The product of its digits is 829440, while the sum is 45.

The square root of 649423845 is about 25483.7957337599. The cubic root of 649423845 is about 865.9830871219.

The spelling of 649423845 in words is "six hundred forty-nine million, four hundred twenty-three thousand, eight hundred forty-five".