649691982 has 32 divisors (see below), whose sum is σ = 1445299200. Its totient is φ = 216333144.

The previous prime is 649691981. The next prime is 649691983. The reversal of 649691982 is 289196946.

649691982 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (649691981) and next prime (649691983).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649691981) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49123 + ... + 60929.

It is an arithmetic number, because the mean of its divisors is an integer number (45165600).

Almost surely, 2^649691982 is an apocalyptic number.

649691982 is an abundant number, since it is smaller than the sum of its proper divisors (795607218).

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

649691982 is a wasteful number, since it uses less digits than its factorization.

649691982 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12837 (or 12831 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 54.

The square root of 649691982 is about 25489.0561221870. The cubic root of 649691982 is about 866.1022543697.

It can be divided in two parts, 6 and 49691982, that multiplied together give a palindrome (298151892).

The spelling of 649691982 in words is "six hundred forty-nine million, six hundred ninety-one thousand, nine hundred eighty-two".