693615985 has 8 divisors (see below), whose sum is σ = 840580776. Its totient is φ = 549398400.

The previous prime is 693615973. The next prime is 693616061. The reversal of 693615985 is 589516396.

It can be written as a sum of positive squares in 4 ways, for example, as 335952241 + 357663744 = 18329^2 + 18912^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 693615985 - 2⁹ = 693615473 is a prime.

It is a super-2 number, since 2×693615985² = 962206269295040450, which contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 686244 + ... + 687253.

It is an arithmetic number, because the mean of its divisors is an integer number (105072597).

Almost surely, 2^693615985 is an apocalyptic number.

It is an amenable number.

693615985 is a deficient number, since it is larger than the sum of its proper divisors (146964791).

693615985 is a wasteful number, since it uses less digits than its factorization.

693615985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1373603.

The product of its digits is 1749600, while the sum is 52.

The square root of 693615985 is about 26336.5902310834. The cubic root of 693615985 is about 885.1965197129.

The spelling of 693615985 in words is "six hundred ninety-three million, six hundred fifteen thousand, nine hundred eighty-five".