128447507 has 2 divisors, whose sum is σ = 128447508. Its totient is φ = 128447506.

The previous prime is 128447491. The next prime is 128447513. The reversal of 128447507 is 705744821.

It is a strong prime.

It is an emirp because it is prime and its reverse (705744821) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 128447507 - 2⁴ = 128447491 is a prime.

It is not a weakly prime, because it can be changed into another prime (128447587) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 64223753 + 64223754.

It is an arithmetic number, because the mean of its divisors is an integer number (64223754).

Almost surely, 2^128447507 is an apocalyptic number.

128447507 is a deficient number, since it is larger than the sum of its proper divisors (1).

128447507 is an equidigital number, since it uses as much as digits as its factorization.

128447507 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 62720, while the sum is 38.

The square root of 128447507 is about 11333.4684452731. The cubic root of 128447507 is about 504.5550529708. Note that the first 3 decimals are identical.

The spelling of 128447507 in words is "one hundred twenty-eight million, four hundred forty-seven thousand, five hundred seven".