349578769 has 4 divisors (see below), whose sum is σ = 370142244. Its totient is φ = 329015296.

The previous prime is 349578767. The next prime is 349578781. The reversal of 349578769 is 967875943.

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

It can be written as a sum of positive squares in 2 ways, for example, as 150430225 + 199148544 = 12265^2 + 14112^2 .

It is a cyclic number.

It is not a de Polignac number, because 349578769 - 2¹ = 349578767 is a prime.

It is a super-2 number, since 2×349578769² = 244410631471110722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (349578767) 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, 10281712 + ... + 10281745.

It is an arithmetic number, because the mean of its divisors is an integer number (92535561).

Almost surely, 2^349578769 is an apocalyptic number.

It is an amenable number.

349578769 is a deficient number, since it is larger than the sum of its proper divisors (20563475).

349578769 is a wasteful number, since it uses less digits than its factorization.

349578769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20563474.

The product of its digits is 11430720, while the sum is 58.

The square root of 349578769 is about 18697.0256725502. The cubic root of 349578769 is about 704.4470415507.

The spelling of 349578769 in words is "three hundred forty-nine million, five hundred seventy-eight thousand, seven hundred sixty-nine".