690955987 has 8 divisors (see below), whose sum is σ = 695794176. Its totient is φ = 686126472.

The previous prime is 690955927. The next prime is 690955999. The reversal of 690955987 is 789559096.

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

It is a cyclic number.

It is not a de Polignac number, because 690955987 - 2¹⁹ = 690431699 is a prime.

It is a super-2 number, since 2×690955987² = 954840351942288338, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690955907) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 270438 + ... + 272980.

It is an arithmetic number, because the mean of its divisors is an integer number (86974272).

Almost surely, 2^690955987 is an apocalyptic number.

690955987 is a deficient number, since it is larger than the sum of its proper divisors (4838189).

690955987 is a wasteful number, since it uses less digits than its factorization.

690955987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337.

The product of its (nonzero) digits is 6123600, while the sum is 58.

The square root of 690955987 is about 26286.0416761444. The cubic root of 690955987 is about 884.0635021061.

The spelling of 690955987 in words is "six hundred ninety million, nine hundred fifty-five thousand, nine hundred eighty-seven".