623450809 has 8 divisors (see below), whose sum is σ = 662583240. Its totient is φ = 584591616.

The previous prime is 623450791. The next prime is 623450813. The reversal of 623450809 is 908054326.

It can be written as a sum of positive squares in 4 ways, for example, as 1447209 + 622003600 = 1203^2 + 24940^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 623450809 - 2¹⁷ = 623319737 is a prime.

It is a super-2 number, since 2×623450809² = 777381822485508962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (623450899) 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, 63594 + ... + 72739.

It is an arithmetic number, because the mean of its divisors is an integer number (82822905).

Almost surely, 2^623450809 is an apocalyptic number.

It is an amenable number.

623450809 is a deficient number, since it is larger than the sum of its proper divisors (39132431).

623450809 is a wasteful number, since it uses less digits than its factorization.

623450809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 136619.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 623450809 is about 24968.9969562255. The cubic root of 623450809 is about 854.2809677041.

The spelling of 623450809 in words is "six hundred twenty-three million, four hundred fifty thousand, eight hundred nine".