690745 has 16 divisors (see below), whose sum is σ = 953280. Its totient is φ = 475200.

The previous prime is 690721. The next prime is 690757. The reversal of 690745 is 547096.

It is not a de Polignac number, because 690745 - 2⁹ = 690233 is a prime.

It is an alternating number because its digits alternate between even and odd.

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, 715 + ... + 1375.

It is an arithmetic number, because the mean of its divisors is an integer number (59580).

2⁶⁹⁰⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

690745 is a deficient number, since it is larger than the sum of its proper divisors (262535).

690745 is a wasteful number, since it uses less digits than its factorization.

690745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 696.

The product of its (nonzero) digits is 7560, while the sum is 31.

The square root of 690745 is about 831.1107026143. The cubic root of 690745 is about 88.3973508485.

The spelling of 690745 in words is "six hundred ninety thousand, seven hundred forty-five".