649902 has 32 divisors (see below), whose sum is σ = 1457280. Its totient is φ = 191520.

The previous prime is 649897. The next prime is 649907. The reversal of 649902 is 209946.

It is an interprime number because it is at equal distance from previous prime (649897) and next prime (649907).

649902 is a Rhonda number in base 4.

It is a self number, because there is not a number n which added to its sum of digits gives 649902.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649907) by changing a digit.

649902 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2724 + ... + 2952.

It is an arithmetic number, because the mean of its divisors is an integer number (45540).

2⁶⁴⁹⁹⁰² is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649902, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (728640).

649902 is an abundant number, since it is smaller than the sum of its proper divisors (807378).

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

649902 is a wasteful number, since it uses less digits than its factorization.

649902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288.

The product of its (nonzero) digits is 3888, while the sum is 30.

The square root of 649902 is about 806.1649955189. The cubic root of 649902 is about 86.6195569085.

It can be divided in two parts, 649 and 902, that added together give a palindrome (1551).

The spelling of 649902 in words is "six hundred forty-nine thousand, nine hundred two".