685948728 has 32 divisors (see below), whose sum is σ = 1754755200. Its totient is φ = 223331808.

The previous prime is 685948727. The next prime is 685948729. The reversal of 685948728 is 827849586.

It is an interprime number because it is at equal distance from previous prime (685948727) and next prime (685948729).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (685948727) 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, 331308 + ... + 333371.

It is an arithmetic number, because the mean of its divisors is an integer number (54836100).

Almost surely, 2^685948728 is an apocalyptic number.

It is an amenable number.

685948728 is an abundant number, since it is smaller than the sum of its proper divisors (1068806472).

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

685948728 is a wasteful number, since it uses less digits than its factorization.

685948728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664731 (or 664727 counting only the distinct ones).

The product of its digits is 7741440, while the sum is 57.

The square root of 685948728 is about 26190.6229020999. The cubic root of 685948728 is about 881.9227620415.

The spelling of 685948728 in words is "six hundred eighty-five million, nine hundred forty-eight thousand, seven hundred twenty-eight".