649670868 has 120 divisors (see below), whose sum is σ = 2117527104. Its totient is φ = 168739200.

The previous prime is 649670863. The next prime is 649670869. The reversal of 649670868 is 868076946.

649670868 is a `hidden beast` number, since 6 + 496 + 70 + 86 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649670863) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 11928 + ... + 37968.

Almost surely, 2^649670868 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649670868, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1058763552).

649670868 is an abundant number, since it is smaller than the sum of its proper divisors (1467856236).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649670868 is a wasteful number, since it uses less digits than its factorization.

649670868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26075 (or 26064 counting only the distinct ones).

The product of its (nonzero) digits is 3483648, while the sum is 54.

The square root of 649670868 is about 25488.6419410686. The cubic root of 649670868 is about 866.0928719333.

The spelling of 649670868 in words is "six hundred forty-nine million, six hundred seventy thousand, eight hundred sixty-eight".