652978809 has 24 divisors (see below), whose sum is σ = 1124802432. Its totient is φ = 356906880.

The previous prime is 652978793. The next prime is 652978811. The reversal of 652978809 is 908879256.

It is a happy number.

It is not a de Polignac number, because 652978809 - 2⁴ = 652978793 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (652978309) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 223872 + ... + 226769.

It is an arithmetic number, because the mean of its divisors is an integer number (46866768).

Almost surely, 2^652978809 is an apocalyptic number.

652978809 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

It is an amenable number.

652978809 is a deficient number, since it is larger than the sum of its proper divisors (471823623).

652978809 is a wasteful number, since it uses less digits than its factorization.

652978809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450677 (or 450674 counting only the distinct ones).

The product of its (nonzero) digits is 2177280, while the sum is 54.

The square root of 652978809 is about 25553.4500410414. The cubic root of 652978809 is about 867.5603510350.

The spelling of 652978809 in words is "six hundred fifty-two million, nine hundred seventy-eight thousand, eight hundred nine".