809967640 has 32 divisors (see below), whose sum is σ = 1842912000. Its totient is φ = 320345344.

The previous prime is 809967619. The next prime is 809967647. The reversal of 809967640 is 46769908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (809967647) 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, 110200 + ... + 117319.

It is an arithmetic number, because the mean of its divisors is an integer number (57591000).

Almost surely, 2^809967640 is an apocalyptic number.

It is an amenable number.

809967640 is an abundant number, since it is smaller than the sum of its proper divisors (1032944360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

809967640 is a wasteful number, since it uses less digits than its factorization.

809967640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227619 (or 227615 counting only the distinct ones).

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 809967640 is about 28459.9304285868. The cubic root of 809967640 is about 932.1573380352.

It can be divided in two parts, 8099676 and 40, that added together give a square (8099716 = 2846²).

The spelling of 809967640 in words is "eight hundred nine million, nine hundred sixty-seven thousand, six hundred forty".