694021770 has 160 divisors (see below), whose sum is σ = 2128463568. Its totient is φ = 160745472.

The previous prime is 694021751. The next prime is 694021771. The reversal of 694021770 is 77120496.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 182493081 + 511528689 = 13509^2 + 22617^2 .

It is not an unprimeable number, because it can be changed into a prime (694021771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 177072 + ... + 180948.

Almost surely, 2^694021770 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 694021770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1064231784).

694021770 is an abundant number, since it is smaller than the sum of its proper divisors (1434441798).

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

694021770 is a wasteful number, since it uses less digits than its factorization.

694021770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3926 (or 3917 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 694021770 is about 26344.2929303483. The cubic root of 694021770 is about 885.3691077409.

The spelling of 694021770 in words is "six hundred ninety-four million, twenty-one thousand, seven hundred seventy".