812782040 has 32 divisors (see below), whose sum is σ = 2090011680. Its totient is φ = 278668032.

The previous prime is 812782031. The next prime is 812782079. The reversal of 812782040 is 40287218.

It is a super-2 number, since 2×812782040² = 1321229289093123200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 812781988 and 812782006.

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, 1451117 + ... + 1451676.

It is an arithmetic number, because the mean of its divisors is an integer number (65312865).

Almost surely, 2^812782040 is an apocalyptic number.

It is an amenable number.

812782040 is an abundant number, since it is smaller than the sum of its proper divisors (1277229640).

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

812782040 is a wasteful number, since it uses less digits than its factorization.

812782040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2902811 (or 2902807 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 32.

The square root of 812782040 is about 28509.3325070932. The cubic root of 812782040 is about 933.2357477337.

The spelling of 812782040 in words is "eight hundred twelve million, seven hundred eighty-two thousand, forty".