812509280 has 48 divisors (see below), whose sum is σ = 2094062544. Its totient is φ = 295457280.

The previous prime is 812509279. The next prime is 812509283. The reversal of 812509280 is 82905218.

It is a super-2 number, since 2×812509280² = 1320342660172236800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 812509280.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (812509283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 229067 + ... + 232586.

It is an arithmetic number, because the mean of its divisors is an integer number (43626303).

Almost surely, 2^812509280 is an apocalyptic number.

812509280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

812509280 is an abundant number, since it is smaller than the sum of its proper divisors (1281553264).

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

812509280 is a wasteful number, since it uses less digits than its factorization.

812509280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461679 (or 461671 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 35.

The square root of 812509280 is about 28504.5484089820. The cubic root of 812509280 is about 933.1313417758.

The spelling of 812509280 in words is "eight hundred twelve million, five hundred nine thousand, two hundred eighty".