649252390 has 8 divisors (see below), whose sum is σ = 1168654320. Its totient is φ = 259700952.

The previous prime is 649252381. The next prime is 649252397. The reversal of 649252390 is 93252946.

649252390 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649252397) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32462610 + ... + 32462629.

It is an arithmetic number, because the mean of its divisors is an integer number (146081790).

Almost surely, 2^649252390 is an apocalyptic number.

649252390 is a deficient number, since it is larger than the sum of its proper divisors (519401930).

649252390 is a wasteful number, since it uses less digits than its factorization.

649252390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64925246.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 649252390 is about 25480.4315112598. The cubic root of 649252390 is about 865.9068707445.

The spelling of 649252390 in words is "six hundred forty-nine million, two hundred fifty-two thousand, three hundred ninety".