694081680 has 80 divisors (see below), whose sum is σ = 2156945280. Its totient is φ = 184633344.

The previous prime is 694081669. The next prime is 694081691. The reversal of 694081680 is 86180496.

It is an interprime number because it is at equal distance from previous prime (694081669) and next prime (694081691).

It is a tau number, because it is divible by the number of its divisors (80).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 100581 + ... + 107259.

It is an arithmetic number, because the mean of its divisors is an integer number (26961816).

Almost surely, 2^694081680 is an apocalyptic number.

694081680 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 694081680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1078472640).

694081680 is an abundant number, since it is smaller than the sum of its proper divisors (1462863600).

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

694081680 is a wasteful number, since it uses less digits than its factorization.

694081680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7128 (or 7122 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 42.

The square root of 694081680 is about 26345.4299642272. The cubic root of 694081680 is about 885.3945828962.

The spelling of 694081680 in words is "six hundred ninety-four million, eighty-one thousand, six hundred eighty".