249728354645987 has 16 divisors (see below), whose sum is σ = 294681761740800. Its totient is φ = 207097774168320.

The previous prime is 249728354645981. The next prime is 249728354645999. The reversal of 249728354645987 is 789546453827942.

It is not a de Polignac number, because 249728354645987 - 2¹⁸ = 249728354383843 is a prime.

It is a super-2 number, since 2×249728354645987² (a number of 30 digits) contains 22 as substring.

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 15 ways as a sum of consecutive naturals, for example, 138462437 + ... + 140254422.

It is an arithmetic number, because the mean of its divisors is an integer number (18417610108800).

Almost surely, 2^{249728354645987} is an apocalyptic number.

249728354645987 is a deficient number, since it is larger than the sum of its proper divisors (44953407094813).

249728354645987 is a wasteful number, since it uses less digits than its factorization.

249728354645987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 278721026.

The product of its digits is 29262643200, while the sum is 83.

The spelling of 249728354645987 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-seven".