249478761292780 has 24 divisors (see below), whose sum is σ = 524000533393008. Its totient is φ = 99773383626048.

The previous prime is 249478761292771. The next prime is 249478761292781. The reversal of 249478761292780 is 87292167874942.

It is a junction number, because it is equal to n+sod(n) for n = 249478761292697 and 249478761292706.

It is not an unprimeable number, because it can be changed into a prime (249478761292781) 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, 1132442799 + ... + 1132663078.

It is an arithmetic number, because the mean of its divisors is an integer number (21833355558042).

Almost surely, 2^{249478761292780} is an apocalyptic number.

249478761292780 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

249478761292780 is an abundant number, since it is smaller than the sum of its proper divisors (274521772100228).

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

249478761292780 is a wasteful number, since it uses less digits than its factorization.

249478761292780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2265111393 (or 2265111391 counting only the distinct ones).

The product of its (nonzero) digits is 1365590016, while the sum is 76.

The spelling of 249478761292780 in words is "two hundred forty-nine trillion, four hundred seventy-eight billion, seven hundred sixty-one million, two hundred ninety-two thousand, seven hundred eighty".