649679616 has 360 divisors, whose sum is σ = 2181397680. Its totient is φ = 191102976.

The previous prime is 649679609. The next prime is 649679623. The reversal of 649679616 is 616976946.

It is an interprime number because it is at equal distance from previous prime (649679609) and next prime (649679623).

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

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6697680 + ... + 6697776.

It is an arithmetic number, because the mean of its divisors is an integer number (6059438).

Almost surely, 2^649679616 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 649679616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1090698840).

649679616 is an abundant number, since it is smaller than the sum of its proper divisors (1531718064).

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

649679616 is a wasteful number, since it uses less digits than its factorization.

649679616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161 (or 138 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 54.

The square root of 649679616 is about 25488.8135463383. The cubic root of 649679616 is about 866.0967593102.

The spelling of 649679616 in words is "six hundred forty-nine million, six hundred seventy-nine thousand, six hundred sixteen".