649686477 has 8 divisors (see below), whose sum is σ = 944998560. Its totient is φ = 393749360.

The previous prime is 649686419. The next prime is 649686493. The reversal of 649686477 is 774686946.

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 649686477 - 2¹⁵ = 649653709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649686277) 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, 9843702 + ... + 9843767.

It is an arithmetic number, because the mean of its divisors is an integer number (118124820).

Almost surely, 2^649686477 is an apocalyptic number.

It is an amenable number.

649686477 is a deficient number, since it is larger than the sum of its proper divisors (295312083).

649686477 is a wasteful number, since it uses less digits than its factorization.

649686477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19687483.

The product of its digits is 12192768, while the sum is 57.

The square root of 649686477 is about 25488.9481344366. The cubic root of 649686477 is about 866.0998081303.

The spelling of 649686477 in words is "six hundred forty-nine million, six hundred eighty-six thousand, four hundred seventy-seven".