649508904 has 96 divisors (see below), whose sum is σ = 1927074240. Its totient is φ = 195993600.

The previous prime is 649508887. The next prime is 649508927. The reversal of 649508904 is 409805946.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 649508904.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201949 + ... + 205139.

It is an arithmetic number, because the mean of its divisors is an integer number (20073690).

Almost surely, 2^649508904 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 649508904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (963537120).

649508904 is an abundant number, since it is smaller than the sum of its proper divisors (1277565336).

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

649508904 is a wasteful number, since it uses less digits than its factorization.

649508904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3471 (or 3464 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 45.

The square root of 649508904 is about 25485.4645631583. The cubic root of 649508904 is about 866.0208931661.

The spelling of 649508904 in words is "six hundred forty-nine million, five hundred eight thousand, nine hundred four".