817780016 has 10 divisors (see below), whose sum is σ = 1584448812. Its totient is φ = 408890000.

The previous prime is 817780013. The next prime is 817780027. The reversal of 817780016 is 610087718.

It is not an unprimeable number, because it can be changed into a prime (817780013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25555610 + ... + 25555641.

Almost surely, 2^817780016 is an apocalyptic number.

It is an amenable number.

817780016 is a deficient number, since it is larger than the sum of its proper divisors (766668796).

817780016 is a wasteful number, since it uses less digits than its factorization.

817780016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51111259 (or 51111253 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 38.

The square root of 817780016 is about 28596.8532534613. The cubic root of 817780016 is about 935.1447309486.

The spelling of 817780016 in words is "eight hundred seventeen million, seven hundred eighty thousand, sixteen".