249728354645989 has 8 divisors (see below), whose sum is σ = 255045525828480. Its totient is φ = 244411341877536.

The previous prime is 249728354645981. The next prime is 249728354645999. The reversal of 249728354645989 is 989546453827942.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 249728354645989 - 2³ = 249728354645981 is a prime.

It is a super-2 number, since 2×249728354645989² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

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, 36414384 + ... + 42725449.

It is an arithmetic number, because the mean of its divisors is an integer number (31880690728560).

Almost surely, 2^{249728354645989} is an apocalyptic number.

It is an amenable number.

249728354645989 is a deficient number, since it is larger than the sum of its proper divisors (5317171182491).

249728354645989 is an equidigital number, since it uses as much as digits as its factorization.

249728354645989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79207019.

The product of its digits is 37623398400, while the sum is 85.

The spelling of 249728354645989 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-nine".