649708987 has 8 divisors (see below), whose sum is σ = 664801200. Its totient is φ = 634760160.

The previous prime is 649708951. The next prime is 649709051. The reversal of 649708987 is 789807946.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 649708987 - 2¹⁵ = 649676219 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (649702987) 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, 26653 + ... + 44830.

It is an arithmetic number, because the mean of its divisors is an integer number (83100150).

Almost surely, 2^649708987 is an apocalyptic number.

649708987 is a deficient number, since it is larger than the sum of its proper divisors (15092213).

649708987 is a wasteful number, since it uses less digits than its factorization.

649708987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71693.

The product of its (nonzero) digits is 6096384, while the sum is 58.

The square root of 649708987 is about 25489.3896945376. The cubic root of 649708987 is about 866.1098107404.

The spelling of 649708987 in words is "six hundred forty-nine million, seven hundred eight thousand, nine hundred eighty-seven".