616910809 has 16 divisors (see below), whose sum is σ = 644688000. Its totient is φ = 589873536.

The previous prime is 616910803. The next prime is 616910813. The reversal of 616910809 is 908019616.

It is a cyclic number.

It is not a de Polignac number, because 616910809 - 2²¹ = 614813657 is a prime.

It is a super-2 number, since 2×616910809² = 761157892522068962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616910803) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 467052 + ... + 468370.

It is an arithmetic number, because the mean of its divisors is an integer number (40293000).

Almost surely, 2^616910809 is an apocalyptic number.

It is an amenable number.

616910809 is a deficient number, since it is larger than the sum of its proper divisors (27777191).

616910809 is a wasteful number, since it uses less digits than its factorization.

616910809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1584.

The product of its (nonzero) digits is 23328, while the sum is 40.

The square root of 616910809 is about 24837.6892846335. The cubic root of 616910809 is about 851.2833251358.

The spelling of 616910809 in words is "six hundred sixteen million, nine hundred ten thousand, eight hundred nine".