720920819 has 16 divisors (see below), whose sum is σ = 813214080. Its totient is φ = 635034240.

The previous prime is 720920803. The next prime is 720920861. The reversal of 720920819 is 918029027.

It is a cyclic number.

It is not a de Polignac number, because 720920819 - 2⁴ = 720920803 is a prime.

It is a super-2 number, since 2×720920819² = 1039453654535261522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (720920869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13364 + ... + 40254.

It is an arithmetic number, because the mean of its divisors is an integer number (50825880).

Almost surely, 2^720920819 is an apocalyptic number.

720920819 is a deficient number, since it is larger than the sum of its proper divisors (92293261).

720920819 is a wasteful number, since it uses less digits than its factorization.

720920819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27010.

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 720920819 is about 26849.9686964436. The cubic root of 720920819 is about 896.6628756736.

The spelling of 720920819 in words is "seven hundred twenty million, nine hundred twenty thousand, eight hundred nineteen".