455720809 has 4 divisors (see below), whose sum is σ = 456773716. Its totient is φ = 454667904.

The previous prime is 455720807. The next prime is 455720893. The reversal of 455720809 is 908027554.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 39438400 + 416282409 = 6280^2 + 20403^2 .

It is a cyclic number.

It is not a de Polignac number, because 455720809 - 2¹ = 455720807 is a prime.

It is a super-2 number, since 2×455720809² = 415362911511228962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (455720803) 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, 525804 + ... + 526669.

It is an arithmetic number, because the mean of its divisors is an integer number (114193429).

Almost surely, 2^455720809 is an apocalyptic number.

It is an amenable number.

455720809 is a deficient number, since it is larger than the sum of its proper divisors (1052907).

455720809 is a wasteful number, since it uses less digits than its factorization.

455720809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1052906.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 455720809 is about 21347.6183449115. The cubic root of 455720809 is about 769.5431083842.

The spelling of 455720809 in words is "four hundred fifty-five million, seven hundred twenty thousand, eight hundred nine".