685720453 has 8 divisors (see below), whose sum is σ = 750322656. Its totient is φ = 621495600.

The previous prime is 685720447. The next prime is 685720471. The reversal of 685720453 is 354027586.

685720453 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 685720453 - 2⁵ = 685720421 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 (685720423) 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, 90526 + ... + 97807.

It is an arithmetic number, because the mean of its divisors is an integer number (93790332).

Almost surely, 2^685720453 is an apocalyptic number.

It is an amenable number.

685720453 is a deficient number, since it is larger than the sum of its proper divisors (64602203).

685720453 is a wasteful number, since it uses less digits than its factorization.

685720453 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188675.

The product of its (nonzero) digits is 201600, while the sum is 40.

The square root of 685720453 is about 26186.2645866111. The cubic root of 685720453 is about 881.8249202998.

The spelling of 685720453 in words is "six hundred eighty-five million, seven hundred twenty thousand, four hundred fifty-three".