690385478 has 16 divisors (see below), whose sum is σ = 1052306640. Its totient is φ = 339661056.

The previous prime is 690385471. The next prime is 690385483. The reversal of 690385478 is 874583096.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (690385471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20426 + ... + 42402.

It is an arithmetic number, because the mean of its divisors is an integer number (65769165).

Almost surely, 2^690385478 is an apocalyptic number.

690385478 is a deficient number, since it is larger than the sum of its proper divisors (361921162).

690385478 is a wasteful number, since it uses less digits than its factorization.

690385478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22231.

The product of its (nonzero) digits is 1451520, while the sum is 50.

The square root of 690385478 is about 26275.1874969523. The cubic root of 690385478 is about 883.8201170604.

The spelling of 690385478 in words is "six hundred ninety million, three hundred eighty-five thousand, four hundred seventy-eight".