345528781 has 8 divisors (see below), whose sum is σ = 374312120. Its totient is φ = 318947616.

The previous prime is 345528767. The next prime is 345528809. The reversal of 345528781 is 187825543.

It can be written as a sum of positive squares in 4 ways, for example, as 142922025 + 202606756 = 11955^2 + 14234^2 .

It is not a de Polignac number, because 345528781 - 2⁵ = 345528749 is a prime.

It is a super-2 number, since 2×345528781² = 238780276998691922, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (345528761) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 76440 + ... + 80833.

It is an arithmetic number, because the mean of its divisors is an integer number (46789015).

Almost surely, 2^345528781 is an apocalyptic number.

It is an amenable number.

345528781 is a deficient number, since it is larger than the sum of its proper divisors (28783339).

345528781 is an equidigital number, since it uses as much as digits as its factorization.

345528781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157312 (or 157286 counting only the distinct ones).

The product of its digits is 268800, while the sum is 43.

The square root of 345528781 is about 18588.4044769851. The cubic root of 345528781 is about 701.7160488550.

The spelling of 345528781 in words is "three hundred forty-five million, five hundred twenty-eight thousand, seven hundred eighty-one".