690391296 has 288 divisors, whose sum is σ = 2459340800. Its totient is φ = 186624000.

The previous prime is 690391283. The next prime is 690391309. The reversal of 690391296 is 692193096.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (690391283) and next prime (690391309).

It is a tau number, because it is divible by the number of its divisors (288).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 918921 + ... + 919671.

Almost surely, 2^690391296 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 690391296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1229670400).

690391296 is an abundant number, since it is smaller than the sum of its proper divisors (1768949504).

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

690391296 is a wasteful number, since it uses less digits than its factorization.

690391296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 802 (or 782 counting only the distinct ones).

The product of its (nonzero) digits is 157464, while the sum is 45.

The square root of 690391296 is about 26275.2982095351. The cubic root of 690391296 is about 883.8225997561.

The spelling of 690391296 in words is "six hundred ninety million, three hundred ninety-one thousand, two hundred ninety-six".