815785794240 has 56 divisors (see below), whose sum is σ = 2590119899760. Its totient is φ = 217542878208.

The previous prime is 815785794209. The next prime is 815785794253. The reversal of 815785794240 is 42497587518.

It is a Harshad number since it is a multiple of its sum of digits (60).

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, 424887475 + ... + 424889394.

Almost surely, 2^815785794240 is an apocalyptic number.

815785794240 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815785794240 is an abundant number, since it is smaller than the sum of its proper divisors (1774334105520).

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

815785794240 is a wasteful number, since it uses less digits than its factorization.

815785794240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 849776889 (or 849776879 counting only the distinct ones).

The product of its (nonzero) digits is 22579200, while the sum is 60.

The spelling of 815785794240 in words is "eight hundred fifteen billion, seven hundred eighty-five million, seven hundred ninety-four thousand, two hundred forty".