678722811 has 16 divisors (see below), whose sum is σ = 985531680. Its totient is φ = 412980480.

The previous prime is 678722771. The next prime is 678722813. The reversal of 678722811 is 118227876.

It is not a de Polignac number, because 678722811 - 2²² = 674528507 is a prime.

It is not an unprimeable number, because it can be changed into a prime (678722813) 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, 94300 + ... + 101241.

It is an arithmetic number, because the mean of its divisors is an integer number (61595730).

Almost surely, 2^678722811 is an apocalyptic number.

678722811 is a deficient number, since it is larger than the sum of its proper divisors (306808869).

678722811 is a wasteful number, since it uses less digits than its factorization.

678722811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195646.

The product of its digits is 75264, while the sum is 42.

The square root of 678722811 is about 26052.3091299025. The cubic root of 678722811 is about 878.8150420855.

The spelling of 678722811 in words is "six hundred seventy-eight million, seven hundred twenty-two thousand, eight hundred eleven".