681769278 has 32 divisors (see below), whose sum is σ = 1515935520. Its totient is φ = 227122560.

The previous prime is 681769273. The next prime is 681769301. The reversal of 681769278 is 872967186.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681769271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139126 + ... + 143942.

It is an arithmetic number, because the mean of its divisors is an integer number (47372985).

Almost surely, 2^681769278 is an apocalyptic number.

681769278 is an abundant number, since it is smaller than the sum of its proper divisors (834166242).

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

681769278 is a wasteful number, since it uses less digits than its factorization.

681769278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7449 (or 7443 counting only the distinct ones).

The product of its digits is 2032128, while the sum is 54.

The square root of 681769278 is about 26110.7119397384. The cubic root of 681769278 is about 880.1279419694.

The spelling of 681769278 in words is "six hundred eighty-one million, seven hundred sixty-nine thousand, two hundred seventy-eight".