690221326 has 4 divisors (see below), whose sum is σ = 1035331992. Its totient is φ = 345110662.

The previous prime is 690221309. The next prime is 690221327. The reversal of 690221326 is 623122096.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690221327) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 172555330 + ... + 172555333.

It is an arithmetic number, because the mean of its divisors is an integer number (258832998).

Almost surely, 2^690221326 is an apocalyptic number.

690221326 is a deficient number, since it is larger than the sum of its proper divisors (345110666).

690221326 is a wasteful number, since it uses less digits than its factorization.

690221326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 345110665.

The product of its (nonzero) digits is 7776, while the sum is 31.

The square root of 690221326 is about 26272.0636037598. The cubic root of 690221326 is about 883.7500632791.

The spelling of 690221326 in words is "six hundred ninety million, two hundred twenty-one thousand, three hundred twenty-six".