690494305 has 8 divisors (see below), whose sum is σ = 829117800. Its totient is φ = 552045696.

The previous prime is 690494303. The next prime is 690494323. The reversal of 690494305 is 503494096.

690494305 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 71081761 + 619412544 = 8431^2 + 24888^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 690494305 - 2¹ = 690494303 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690494303) 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, 34870 + ... + 50959.

It is an arithmetic number, because the mean of its divisors is an integer number (103639725).

Almost surely, 2^690494305 is an apocalyptic number.

It is an amenable number.

690494305 is a deficient number, since it is larger than the sum of its proper divisors (138623495).

690494305 is a wasteful number, since it uses less digits than its factorization.

690494305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87443.

The product of its (nonzero) digits is 116640, while the sum is 40.

The square root of 690494305 is about 26277.2583235010. The cubic root of 690494305 is about 883.8665541315.

The spelling of 690494305 in words is "six hundred ninety million, four hundred ninety-four thousand, three hundred five".