690311808 has 160 divisors (see below), whose sum is σ = 2073456000. Its totient is φ = 227971584.

The previous prime is 690311779. The next prime is 690311861. The reversal of 690311808 is 808113096.

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

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1440913 + ... + 1441391.

It is an arithmetic number, because the mean of its divisors is an integer number (12959100).

Almost surely, 2^690311808 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 690311808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1036728000).

690311808 is an abundant number, since it is smaller than the sum of its proper divisors (1383144192).

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

690311808 is a wasteful number, since it uses less digits than its factorization.

690311808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 644 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 690311808 is about 26273.7855666061. The cubic root of 690311808 is about 883.7886789020.

The spelling of 690311808 in words is "six hundred ninety million, three hundred eleven thousand, eight hundred eight".