690891379 has 4 divisors (see below), whose sum is σ = 697005576. Its totient is φ = 684777184.

The previous prime is 690891371. The next prime is 690891391. The reversal of 690891379 is 973198096.

690891379 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 690891379 - 2³ = 690891371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (690891371) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3056929 + ... + 3057154.

It is an arithmetic number, because the mean of its divisors is an integer number (174251394).

Almost surely, 2^690891379 is an apocalyptic number.

690891379 is a deficient number, since it is larger than the sum of its proper divisors (6114197).

690891379 is a wasteful number, since it uses less digits than its factorization.

690891379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6114196.

The product of its (nonzero) digits is 734832, while the sum is 52.

The square root of 690891379 is about 26284.8127061998. The cubic root of 690891379 is about 884.0359463929.

The spelling of 690891379 in words is "six hundred ninety million, eight hundred ninety-one thousand, three hundred seventy-nine".