815715040 has 48 divisors (see below), whose sum is σ = 2202433632. Its totient is φ = 279673344.

The previous prime is 815715037. The next prime is 815715041. The reversal of 815715040 is 40517518.

It is a junction number, because it is equal to n+sod(n) for n = 815714993 and 815715011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (815715041) 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, 363039 + ... + 365278.

It is an arithmetic number, because the mean of its divisors is an integer number (45884034).

Almost surely, 2^815715040 is an apocalyptic number.

815715040 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

815715040 is an abundant number, since it is smaller than the sum of its proper divisors (1386718592).

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

815715040 is a wasteful number, since it uses less digits than its factorization.

815715040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728339 (or 728331 counting only the distinct ones).

The product of its (nonzero) digits is 5600, while the sum is 31.

The square root of 815715040 is about 28560.7254809817. The cubic root of 815715040 is about 934.3569563075.

The spelling of 815715040 in words is "eight hundred fifteen million, seven hundred fifteen thousand, forty".