813085780 has 24 divisors (see below), whose sum is σ = 1838825352. Its totient is φ = 300216192.

The previous prime is 813085771. The next prime is 813085813. The reversal of 813085780 is 87580318.

It can be written as a sum of positive squares in 4 ways, for example, as 12082576 + 801003204 = 3476^2 + 28302^2 .

It is a super-2 number, since 2×813085780² = 1322216971276416800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1563367 + ... + 1563886.

It is an arithmetic number, because the mean of its divisors is an integer number (76617723).

Almost surely, 2^813085780 is an apocalyptic number.

It is an amenable number.

813085780 is an abundant number, since it is smaller than the sum of its proper divisors (1025739572).

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

813085780 is a wasteful number, since it uses less digits than its factorization.

813085780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3127275 (or 3127273 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 40.

The square root of 813085780 is about 28514.6590370637. The cubic root of 813085780 is about 933.3519846046.

The spelling of 813085780 in words is "eight hundred thirteen million, eighty-five thousand, seven hundred eighty".