720037649 has 8 divisors (see below), whose sum is σ = 739966248. Its totient is φ = 700133760.

The previous prime is 720037631. The next prime is 720037657. The reversal of 720037649 is 946730027.

It can be written as a sum of positive squares in 4 ways, for example, as 153264400 + 566773249 = 12380^2 + 23807^2 .

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-720037649 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720037249) 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, 63629 + ... + 74085.

It is an arithmetic number, because the mean of its divisors is an integer number (92495781).

Almost surely, 2^720037649 is an apocalyptic number.

It is an amenable number.

720037649 is a deficient number, since it is larger than the sum of its proper divisors (19928599).

720037649 is a wasteful number, since it uses less digits than its factorization.

720037649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12355.

The product of its (nonzero) digits is 63504, while the sum is 38.

The square root of 720037649 is about 26833.5172685207. The cubic root of 720037649 is about 896.2965712991.

The spelling of 720037649 in words is "seven hundred twenty million, thirty-seven thousand, six hundred forty-nine".