720649278 has 64 divisors (see below), whose sum is σ = 1713337920. Its totient is φ = 223727616.

The previous prime is 720649277. The next prime is 720649327. The reversal of 720649278 is 872946027.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720649277) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 85000 + ... + 93092.

It is an arithmetic number, because the mean of its divisors is an integer number (26770905).

Almost surely, 2^720649278 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720649278, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (856668960).

720649278 is an abundant number, since it is smaller than the sum of its proper divisors (992688642).

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

720649278 is a wasteful number, since it uses less digits than its factorization.

720649278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8218 (or 8212 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 720649278 is about 26844.9115848795. The cubic root of 720649278 is about 896.5502829526.

The spelling of 720649278 in words is "seven hundred twenty million, six hundred forty-nine thousand, two hundred seventy-eight".