690344993 has 36 divisors (see below), whose sum is σ = 835144380. Its totient is φ = 567074304.

The previous prime is 690344969. The next prime is 690345077. The reversal of 690344993 is 399443096.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 48888064 + 641456929 = 6992^2 + 25327^2 .

It is not a de Polignac number, because 690344993 - 2⁶ = 690344929 is a prime.

It is not an unprimeable number, because it can be changed into a prime (690344903) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 1356023 + ... + 1356531.

It is an arithmetic number, because the mean of its divisors is an integer number (23198455).

Almost surely, 2^690344993 is an apocalyptic number.

It is an amenable number.

690344993 is a deficient number, since it is larger than the sum of its proper divisors (144799387).

690344993 is a wasteful number, since it uses less digits than its factorization.

690344993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 594 (or 558 counting only the distinct ones).

The product of its (nonzero) digits is 629856, while the sum is 47.

The square root of 690344993 is about 26274.4170820211. The cubic root of 690344993 is about 883.8028406460.

The spelling of 690344993 in words is "six hundred ninety million, three hundred forty-four thousand, nine hundred ninety-three".