649090 has 16 divisors (see below), whose sum is σ = 1258488. Its totient is φ = 239616.

The previous prime is 649087. The next prime is 649093. The reversal of 649090 is 90946.

649090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (649087) and next prime (649093).

It can be written as a sum of positive squares in 4 ways, for example, as 356409 + 292681 = 597^2 + 541^2 .

It is not an unprimeable number, because it can be changed into a prime (649093) 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, 2367 + ... + 2626.

2⁶⁴⁹⁰⁹⁰ is an apocalyptic number.

649090 is a deficient number, since it is larger than the sum of its proper divisors (609398).

649090 is a wasteful number, since it uses less digits than its factorization.

649090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5013.

The product of its (nonzero) digits is 1944, while the sum is 28.

The square root of 649090 is about 805.6612191238. The cubic root of 649090 is about 86.5834671631.

The spelling of 649090 in words is "six hundred forty-nine thousand, ninety".