690690312 has 96 divisors (see below), whose sum is σ = 2047707480. Its totient is φ = 209018880.

The previous prime is 690690277. The next prime is 690690313. The reversal of 690690312 is 213096096.

It can be written as a sum of positive squares in 4 ways, for example, as 91126116 + 599564196 = 9546^2 + 24486^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (690690313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51048 + ... + 63144.

Almost surely, 2^690690312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 690690312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1023853740).

690690312 is an abundant number, since it is smaller than the sum of its proper divisors (1357017168).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

690690312 is a wasteful number, since it uses less digits than its factorization.

690690312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12183 (or 12176 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 36.

The square root of 690690312 is about 26280.9876526739. The cubic root of 690690312 is about 883.9501790749.

The spelling of 690690312 in words is "six hundred ninety million, six hundred ninety thousand, three hundred twelve".