690405073 has 2 divisors, whose sum is σ = 690405074. Its totient is φ = 690405072.

The previous prime is 690405041. The next prime is 690405091. The reversal of 690405073 is 370504096.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 463842369 + 226562704 = 21537^2 + 15052^2 .

It is a cyclic number.

It is not a de Polignac number, because 690405073 - 2⁵ = 690405041 is a prime.

It is not a weakly prime, because it can be changed into another prime (690415073) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 345202536 + 345202537.

It is an arithmetic number, because the mean of its divisors is an integer number (345202537).

Almost surely, 2^690405073 is an apocalyptic number.

It is an amenable number.

690405073 is a deficient number, since it is larger than the sum of its proper divisors (1).

690405073 is an equidigital number, since it uses as much as digits as its factorization.

690405073 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 22680, while the sum is 34.

The square root of 690405073 is about 26275.5603746143. The cubic root of 690405073 is about 883.8284787134.

The spelling of 690405073 in words is "six hundred ninety million, four hundred five thousand, seventy-three".