249999999988 has 12 divisors (see below), whose sum is σ = 438539195332. Its totient is φ = 124703087040.

The previous prime is 249999999973. The next prime is 250000000007. The reversal of 249999999988 is 889999999942.

249999999988 is digitally balanced in base 2, 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 2 ways, for example, as 55564861284 + 194435138704 = 235722^2 + 440948^2 .

It is a junction number, because it is equal to n+sod(n) for n = 249999999896 and 249999999905.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74226345 + ... + 74229712.

Almost surely, 2^249999999988 is an apocalyptic number.

It is an amenable number.

249999999988 is a deficient number, since it is larger than the sum of its proper divisors (188539195344).

249999999988 is a wasteful number, since it uses less digits than its factorization.

249999999988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 148456482 (or 148456480 counting only the distinct ones).

The product of its digits is 22039921152, while the sum is 94.

It can be divided in two parts, 2499999999 and 88, that multiplied together give a palindrome (219999999912).

The spelling of 249999999988 in words is "two hundred forty-nine billion, nine hundred ninety-nine million, nine hundred ninety-nine thousand, nine hundred eighty-eight".