249728354645988 has 24 divisors (see below), whose sum is σ = 586610229038400. Its totient is φ = 82684108472800.

The previous prime is 249728354645981. The next prime is 249728354645999. The reversal of 249728354645988 is 889546453827942.

It is a super-2 number, since 2×249728354645988² (a number of 30 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 249728354645988.

It is not an unprimeable number, because it can be changed into a prime (249728354645981) 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, 69834549288 + ... + 69834552863.

It is an arithmetic number, because the mean of its divisors is an integer number (24442092876600).

Almost surely, 2^{249728354645988} is an apocalyptic number.

It is an amenable number.

249728354645988 is an abundant number, since it is smaller than the sum of its proper divisors (336881874392412).

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

249728354645988 is a wasteful number, since it uses less digits than its factorization.

249728354645988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139669102307 (or 139669102305 counting only the distinct ones).

The product of its digits is 33443020800, while the sum is 84.

The spelling of 249728354645988 in words is "two hundred forty-nine trillion, seven hundred twenty-eight billion, three hundred fifty-four million, six hundred forty-five thousand, nine hundred eighty-eight".