649788340 has 12 divisors (see below), whose sum is σ = 1364555556. Its totient is φ = 259915328.

The previous prime is 649788329. The next prime is 649788343. The reversal of 649788340 is 43887946.

It can be written as a sum of positive squares in 2 ways, for example, as 510217744 + 139570596 = 22588^2 + 11814^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649788343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16244689 + ... + 16244728.

It is an arithmetic number, because the mean of its divisors is an integer number (113712963).

Almost surely, 2^649788340 is an apocalyptic number.

It is an amenable number.

649788340 is an abundant number, since it is smaller than the sum of its proper divisors (714767216).

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

649788340 is a wasteful number, since it uses less digits than its factorization.

649788340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32489426 (or 32489424 counting only the distinct ones).

The product of its (nonzero) digits is 1161216, while the sum is 49.

The square root of 649788340 is about 25490.9462358697. The cubic root of 649788340 is about 866.1450704312.

The spelling of 649788340 in words is "six hundred forty-nine million, seven hundred eighty-eight thousand, three hundred forty".