690044987 has 8 divisors (see below), whose sum is σ = 697064400. Its totient is φ = 683059104.

The previous prime is 690044981. The next prime is 690045007. The reversal of 690044987 is 789440096.

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 690044987 - 2⁸ = 690044731 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690044981) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34064 + ... + 50402.

It is an arithmetic number, because the mean of its divisors is an integer number (87133050).

Almost surely, 2^690044987 is an apocalyptic number.

690044987 is a deficient number, since it is larger than the sum of its proper divisors (7019413).

690044987 is a wasteful number, since it uses less digits than its factorization.

690044987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16765.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 690044987 is about 26268.7073720806. The cubic root of 690044987 is about 883.6747961777.

The spelling of 690044987 in words is "six hundred ninety million, forty-four thousand, nine hundred eighty-seven".