649487793 has 4 divisors (see below), whose sum is σ = 865983728. Its totient is φ = 432991860.

The previous prime is 649487791. The next prime is 649487807. The reversal of 649487793 is 397784946.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 649487793 - 2¹ = 649487791 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649487791) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 108247963 + ... + 108247968.

It is an arithmetic number, because the mean of its divisors is an integer number (216495932).

Almost surely, 2^649487793 is an apocalyptic number.

It is an amenable number.

649487793 is a deficient number, since it is larger than the sum of its proper divisors (216495935).

649487793 is a wasteful number, since it uses less digits than its factorization.

649487793 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216495934.

The product of its digits is 9144576, while the sum is 57.

The square root of 649487793 is about 25485.0503825282. The cubic root of 649487793 is about 866.0115103001.

The spelling of 649487793 in words is "six hundred forty-nine million, four hundred eighty-seven thousand, seven hundred ninety-three".