813061540 has 24 divisors (see below), whose sum is σ = 1708012152. Its totient is φ = 325113600.

The previous prime is 813061531. The next prime is 813061559. The reversal of 813061540 is 45160318.

It can be written as a sum of positive squares in 4 ways, for example, as 16467364 + 796594176 = 4058^2 + 28224^2 .

It is a super-2 number, since 2×813061540² = 1322138135654343200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813061499 and 813061508.

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, 79182 + ... + 88858.

It is an arithmetic number, because the mean of its divisors is an integer number (71167173).

Almost surely, 2^813061540 is an apocalyptic number.

It is an amenable number.

813061540 is an abundant number, since it is smaller than the sum of its proper divisors (894950612).

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

813061540 is a wasteful number, since it uses less digits than its factorization.

813061540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13887 (or 13885 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 28.

The square root of 813061540 is about 28514.2339893605. The cubic root of 813061540 is about 933.3427093729.

The spelling of 813061540 in words is "eight hundred thirteen million, sixty-one thousand, five hundred forty".