690112729 has 4 divisors (see below), whose sum is σ = 692317876. Its totient is φ = 687907584.

The previous prime is 690112691. The next prime is 690112751. The reversal of 690112729 is 927211096.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 187142400 + 502970329 = 13680^2 + 22427^2 .

It is a cyclic number.

It is not a de Polignac number, because 690112729 - 2⁷ = 690112601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690112799) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1102104 + ... + 1102729.

It is an arithmetic number, because the mean of its divisors is an integer number (173079469).

Almost surely, 2^690112729 is an apocalyptic number.

It is an amenable number.

690112729 is a deficient number, since it is larger than the sum of its proper divisors (2205147).

690112729 is a wasteful number, since it uses less digits than its factorization.

690112729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2205146.

The product of its (nonzero) digits is 13608, while the sum is 37.

The square root of 690112729 is about 26269.9967453367. The cubic root of 690112729 is about 883.7037121374.

The spelling of 690112729 in words is "six hundred ninety million, one hundred twelve thousand, seven hundred twenty-nine".