685180772 has 6 divisors (see below), whose sum is σ = 1199066358. Its totient is φ = 342590384.

The previous prime is 685180759. The next prime is 685180777. The reversal of 685180772 is 277081586.

It can be written as a sum of positive squares in only one way, i.e., 559606336 + 125574436 = 23656^2 + 11206^2 .

It is not an unprimeable number, because it can be changed into a prime (685180777) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85647593 + ... + 85647600.

It is an arithmetic number, because the mean of its divisors is an integer number (199844393).

Almost surely, 2^685180772 is an apocalyptic number.

It is an amenable number.

685180772 is a deficient number, since it is larger than the sum of its proper divisors (513885586).

685180772 is a wasteful number, since it uses less digits than its factorization.

685180772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171295197 (or 171295195 counting only the distinct ones).

The product of its (nonzero) digits is 188160, while the sum is 44.

The square root of 685180772 is about 26175.9579003329. The cubic root of 685180772 is about 881.5935193660.

The spelling of 685180772 in words is "six hundred eighty-five million, one hundred eighty thousand, seven hundred seventy-two".