690913287 has 8 divisors (see below), whose sum is σ = 1023575280. Its totient is φ = 460608840.

The previous prime is 690913271. The next prime is 690913291. The reversal of 690913287 is 782319096.

It is not a de Polignac number, because 690913287 - 2⁴ = 690913271 is a prime.

It is a super-2 number, since 2×690913287² = 954722340306288738, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690913297) 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, 12794664 + ... + 12794717.

It is an arithmetic number, because the mean of its divisors is an integer number (127946910).

Almost surely, 2^690913287 is an apocalyptic number.

690913287 is a deficient number, since it is larger than the sum of its proper divisors (332661993).

690913287 is a wasteful number, since it uses less digits than its factorization.

690913287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25589390 (or 25589384 counting only the distinct ones).

The product of its (nonzero) digits is 163296, while the sum is 45.

The square root of 690913287 is about 26285.2294454509. The cubic root of 690913287 is about 884.0452904834.

The spelling of 690913287 in words is "six hundred ninety million, nine hundred thirteen thousand, two hundred eighty-seven".