649684623 has 8 divisors (see below), whose sum is σ = 989995648. Its totient is φ = 371248344.

The previous prime is 649684601. The next prime is 649684649. The reversal of 649684623 is 326486946.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 649684623 - 2⁶ = 649684559 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649684663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15468661 + ... + 15468702.

It is an arithmetic number, because the mean of its divisors is an integer number (123749456).

Almost surely, 2^649684623 is an apocalyptic number.

649684623 is a deficient number, since it is larger than the sum of its proper divisors (340311025).

649684623 is a wasteful number, since it uses less digits than its factorization.

649684623 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30937373.

The product of its digits is 1492992, while the sum is 48.

The square root of 649684623 is about 25488.9117657071. The cubic root of 649684623 is about 866.0989842711.

It can be divided in two parts, 6496 and 84623, that added together give a palindrome (91119).

The spelling of 649684623 in words is "six hundred forty-nine million, six hundred eighty-four thousand, six hundred twenty-three".