128722047 has 8 divisors (see below), whose sum is σ = 173802240. Its totient is φ = 84728280.

The previous prime is 128722043. The next prime is 128722051. The reversal of 128722047 is 740227821.

It is an interprime number because it is at equal distance from previous prime (128722043) and next prime (128722051).

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

It is not a de Polignac number, because 128722047 - 2² = 128722043 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128721999 and 128722017.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128722043) 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, 271329 + ... + 271802.

It is an arithmetic number, because the mean of its divisors is an integer number (21725280).

Almost surely, 2^128722047 is an apocalyptic number.

128722047 is a deficient number, since it is larger than the sum of its proper divisors (45080193).

128722047 is an equidigital number, since it uses as much as digits as its factorization.

128722047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 543213.

The product of its (nonzero) digits is 12544, while the sum is 33.

The square root of 128722047 is about 11345.5738946957. The cubic root of 128722047 is about 504.9142709750.

Adding to 128722047 its reverse (740227821), we get a palindrome (868949868).

The spelling of 128722047 in words is "one hundred twenty-eight million, seven hundred twenty-two thousand, forty-seven".