649231140 has 96 divisors (see below), whose sum is σ = 1975357440. Its totient is φ = 158716800.

The previous prime is 649231129. The next prime is 649231147. The reversal of 649231140 is 41132946.

649231140 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 649231098 and 649231107.

It is not an unprimeable number, because it can be changed into a prime (649231147) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26155 + ... + 44525.

It is an arithmetic number, because the mean of its divisors is an integer number (20576640).

Almost surely, 2^649231140 is an apocalyptic number.

649231140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 649231140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987678720).

649231140 is an abundant number, since it is smaller than the sum of its proper divisors (1326126300).

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

649231140 is a wasteful number, since it uses less digits than its factorization.

649231140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18433 (or 18431 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 649231140 is about 25480.0145211890. The cubic root of 649231140 is about 865.8974236111.

The spelling of 649231140 in words is "six hundred forty-nine million, two hundred thirty-one thousand, one hundred forty".