649433687 has 8 divisors (see below), whose sum is σ = 759470976. Its totient is φ = 543711672.

The previous prime is 649433683. The next prime is 649433689. The reversal of 649433687 is 786334946.

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

It is not a de Polignac number, because 649433687 - 2² = 649433683 is a prime.

It is a super-2 number, since 2×649433687² = 843528227620827938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649433683) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1078493 + ... + 1079094.

It is an arithmetic number, because the mean of its divisors is an integer number (94933872).

Almost surely, 2^649433687 is an apocalyptic number.

649433687 is a deficient number, since it is larger than the sum of its proper divisors (110037289).

649433687 is a wasteful number, since it uses less digits than its factorization.

649433687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2157637.

The product of its digits is 2612736, while the sum is 50.

The square root of 649433687 is about 25483.9888361300. The cubic root of 649433687 is about 865.9874617496.

The spelling of 649433687 in words is "six hundred forty-nine million, four hundred thirty-three thousand, six hundred eighty-seven".