649140805 has 12 divisors (see below), whose sum is σ = 782286372. Its totient is φ = 517107200.

The previous prime is 649140803. The next prime is 649140809. The reversal of 649140805 is 508041946.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 5909761 + 643231044 = 2431^2 + 25362^2 .

It is not a de Polignac number, because 649140805 - 2¹ = 649140803 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 (649140803) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1140561 + ... + 1141129.

It is an arithmetic number, because the mean of its divisors is an integer number (65190531).

Almost surely, 2^649140805 is an apocalyptic number.

It is an amenable number.

649140805 is a deficient number, since it is larger than the sum of its proper divisors (133145567).

649140805 is an frugal number, since it uses more digits than its factorization.

649140805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1544 (or 975 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 649140805 is about 25478.2417956970. The cubic root of 649140805 is about 865.8572609905.

The spelling of 649140805 in words is "six hundred forty-nine million, one hundred forty thousand, eight hundred five".