813097640 has 32 divisors (see below), whose sum is σ = 1833014880. Its totient is φ = 324608832.

The previous prime is 813097639. The next prime is 813097643. The reversal of 813097640 is 46790318.

It is a super-2 number, since 2×813097640² = 1322255544347139200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 813097594 and 813097603.

It is not an unprimeable number, because it can be changed into a prime (813097643) 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, 1487 + ... + 40353.

It is an arithmetic number, because the mean of its divisors is an integer number (57281715).

Almost surely, 2^813097640 is an apocalyptic number.

It is an amenable number.

813097640 is an abundant number, since it is smaller than the sum of its proper divisors (1019917240).

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

813097640 is a wasteful number, since it uses less digits than its factorization.

813097640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39401 (or 39397 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 813097640 is about 28514.8669995145. The cubic root of 813097640 is about 933.3565226665.

The spelling of 813097640 in words is "eight hundred thirteen million, ninety-seven thousand, six hundred forty".