720843849 has 12 divisors (see below), whose sum is σ = 1135875312. Its totient is φ = 436875000.

The previous prime is 720843839. The next prime is 720843863. The reversal of 720843849 is 948348027.

720843849 is a `hidden beast` number, since 7 + 208 + 438 + 4 + 9 = 666.

It is not a de Polignac number, because 720843849 - 2⁵ = 720843817 is a prime.

It is a super-2 number, since 2×720843849² = 1039231709282269602, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (720843839) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3640527 + ... + 3640724.

It is an arithmetic number, because the mean of its divisors is an integer number (94656276).

Almost surely, 2^720843849 is an apocalyptic number.

It is an amenable number.

720843849 is a deficient number, since it is larger than the sum of its proper divisors (415031463).

720843849 is a wasteful number, since it uses less digits than its factorization.

720843849 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7281268 (or 7281265 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 45.

The square root of 720843849 is about 26848.5353231792. The cubic root of 720843849 is about 896.6309634321.

The spelling of 720843849 in words is "seven hundred twenty million, eight hundred forty-three thousand, eight hundred forty-nine".