690881803249 has 81 divisors (see below), whose sum is σ = 830052167553. Its totient is φ = 574520601600.

The previous prime is 690881803219. The next prime is 690881803277. The reversal of 690881803249 is 942308188096.

The square root of 690881803249 is 831193.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 4 ways, for example, as 230068919025 + 460812884224 = 479655^2 + 678832^2 .

It is not a de Polignac number, because 690881803249 - 2⁵ = 690881803217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 690881803193 and 690881803202.

It is not an unprimeable number, because it can be changed into a prime (690881803219) by changing a digit.

It is a polite number, since it can be written in 80 ways as a sum of consecutive naturals, for example, 7122492769 + ... + 7122492865.

Almost surely, 2^690881803249 is an apocalyptic number.

690881803249 is the 831193-rd square number.

690881803249 is the 415597-th centered octagonal number.

It is an amenable number.

690881803249 is a deficient number, since it is larger than the sum of its proper divisors (139170364304).

690881803249 is an equidigital number, since it uses as much as digits as its factorization.

690881803249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 336 (or 168 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 58.

The spelling of 690881803249 in words is "six hundred ninety billion, eight hundred eighty-one million, eight hundred three thousand, two hundred forty-nine".