649529380 has 24 divisors (see below), whose sum is σ = 1397282040. Its totient is φ = 253474560.

The previous prime is 649529351. The next prime is 649529381. The reversal of 649529380 is 83925946.

It can be written as a sum of positive squares in 4 ways, for example, as 112402404 + 537126976 = 10602^2 + 23176^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 649529380.

It is not an unprimeable number, because it can be changed into a prime (649529381) 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, 395235 + ... + 396874.

It is an arithmetic number, because the mean of its divisors is an integer number (58220085).

Almost surely, 2^649529380 is an apocalyptic number.

It is an amenable number.

649529380 is an abundant number, since it is smaller than the sum of its proper divisors (747752660).

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

649529380 is a wasteful number, since it uses less digits than its factorization.

649529380 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 792159 (or 792157 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 649529380 is about 25485.8662791752. The cubic root of 649529380 is about 866.0299936097.

The spelling of 649529380 in words is "six hundred forty-nine million, five hundred twenty-nine thousand, three hundred eighty".