345728690 has 8 divisors (see below), whose sum is σ = 622311660. Its totient is φ = 138291472.

The previous prime is 345728689. The next prime is 345728717. The reversal of 345728690 is 96827543.

It can be written as a sum of positive squares in 2 ways, for example, as 337714129 + 8014561 = 18377^2 + 2831^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×345728690² = 239056654178232200, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17286425 + ... + 17286444.

Almost surely, 2^345728690 is an apocalyptic number.

345728690 is a deficient number, since it is larger than the sum of its proper divisors (276582970).

345728690 is a wasteful number, since it uses less digits than its factorization.

345728690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34572876.

The product of its (nonzero) digits is 362880, while the sum is 44.

The square root of 345728690 is about 18593.7809495541. The cubic root of 345728690 is about 701.8513509549.

The spelling of 345728690 in words is "three hundred forty-five million, seven hundred twenty-eight thousand, six hundred ninety".