349172778 has 32 divisors (see below), whose sum is σ = 731658240. Its totient is φ = 110951280.

The previous prime is 349172773. The next prime is 349172801. The reversal of 349172778 is 877271943.

It is not an unprimeable number, because it can be changed into a prime (349172773) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1548 + ... + 26471.

It is an arithmetic number, because the mean of its divisors is an integer number (22864320).

Almost surely, 2^349172778 is an apocalyptic number.

349172778 is an abundant number, since it is smaller than the sum of its proper divisors (382485462).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

349172778 is a wasteful number, since it uses less digits than its factorization.

349172778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28122.

The product of its digits is 592704, while the sum is 48.

The square root of 349172778 is about 18686.1654172278. The cubic root of 349172778 is about 704.1742275501.

The spelling of 349172778 in words is "three hundred forty-nine million, one hundred seventy-two thousand, seven hundred seventy-eight".