720899477 has 4 divisors (see below), whose sum is σ = 725066700. Its totient is φ = 716732256.

The previous prime is 720899471. The next prime is 720899483. The reversal of 720899477 is 774998027.

720899477 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 774998027 = 89 ⋅8707843.

It is an interprime number because it is at equal distance from previous prime (720899471) and next prime (720899483).

It can be written as a sum of positive squares in 2 ways, for example, as 677352676 + 43546801 = 26026^2 + 6599^2 .

It is a cyclic number.

It is not a de Polignac number, because 720899477 - 2¹⁶ = 720833941 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720899471) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2083352 + ... + 2083697.

It is an arithmetic number, because the mean of its divisors is an integer number (181266675).

Almost surely, 2^720899477 is an apocalyptic number.

It is an amenable number.

720899477 is a deficient number, since it is larger than the sum of its proper divisors (4167223).

720899477 is a wasteful number, since it uses less digits than its factorization.

720899477 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4167222.

The product of its (nonzero) digits is 1778112, while the sum is 53.

The square root of 720899477 is about 26849.5712628712. The cubic root of 720899477 is about 896.6540273750.

The spelling of 720899477 in words is "seven hundred twenty million, eight hundred ninety-nine thousand, four hundred seventy-seven".