649140804 has 120 divisors (see below), whose sum is σ = 1838227160. Its totient is φ = 198567936.

The previous prime is 649140803. The next prime is 649140809. The reversal of 649140804 is 408041946.

It is a happy number.

649140804 is a `hidden beast` number, since 649 + 1 + 4 + 0 + 8 + 0 + 4 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 84603204 + 564537600 = 9198^2 + 23760^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649140803) 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, 964212 + ... + 964884.

Almost surely, 2^649140804 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 649140804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (919113580).

649140804 is an abundant number, since it is smaller than the sum of its proper divisors (1189086356).

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

649140804 is a wasteful number, since it uses less digits than its factorization.

649140804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 931 (or 920 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 649140804 is about 25478.2417760724. The cubic root of 649140804 is about 865.8572605459.

The spelling of 649140804 in words is "six hundred forty-nine million, one hundred forty thousand, eight hundred four".