128757247 has 6 divisors (see below), whose sum is σ = 129638544. Its totient is φ = 127881900.

The previous prime is 128757241. The next prime is 128757263. The reversal of 128757247 is 742757821.

It is not a de Polignac number, because 128757247 - 2¹¹ = 128755199 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128757241) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 19978 + ... + 25624.

It is an arithmetic number, because the mean of its divisors is an integer number (21606424).

Almost surely, 2^128757247 is an apocalyptic number.

128757247 is a deficient number, since it is larger than the sum of its proper divisors (881297).

128757247 is an frugal number, since it uses more digits than its factorization.

128757247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5949 (or 5798 counting only the distinct ones).

The product of its digits is 219520, while the sum is 43.

The square root of 128757247 is about 11347.1250543915. The cubic root of 128757247 is about 504.9602909665.

The spelling of 128757247 in words is "one hundred twenty-eight million, seven hundred fifty-seven thousand, two hundred forty-seven".