720477 has 18 divisors (see below), whose sum is σ = 1109498. Its totient is φ = 450432.

The previous prime is 720439. The next prime is 720481. The reversal of 720477 is 774027.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 171396 + 549081 = 414^2 + 741^2 .

It is not a de Polignac number, because 720477 - 2⁶ = 720413 is a prime.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Duffinian number.

720477 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 720477.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720407) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2463 + ... + 2739.

2⁷²⁰⁴⁷⁷ is an apocalyptic number.

It is an amenable number.

720477 is a deficient number, since it is larger than the sum of its proper divisors (389021).

720477 is a wasteful number, since it uses less digits than its factorization.

720477 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 317 (or 297 counting only the distinct ones).

The product of its (nonzero) digits is 2744, while the sum is 27.

The square root of 720477 is about 848.8091658318. The cubic root of 720477 is about 89.6478834328.

The spelling of 720477 in words is "seven hundred twenty thousand, four hundred seventy-seven", and thus it is an iban number.