249641780 has 18 divisors (see below), whose sum is σ = 524396166. Its totient is φ = 99828448.

The previous prime is 249641731. The next prime is 249641797. The reversal of 249641780 is 87146942.

249641780 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 3 ways, for example, as 95335696 + 154306084 = 9764^2 + 12422^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 68894 + ... + 72426.

Almost surely, 2^249641780 is an apocalyptic number.

249641780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249641780 is an abundant number, since it is smaller than the sum of its proper divisors (274754386).

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

249641780 is an frugal number, since it uses more digits than its factorization.

249641780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7075 (or 3540 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 41.

The square root of 249641780 is about 15800.0563290135. The cubic root of 249641780 is about 629.6594951761.

The spelling of 249641780 in words is "two hundred forty-nine million, six hundred forty-one thousand, seven hundred eighty".