128857701 has 48 divisors (see below), whose sum is σ = 209139840. Its totient is φ = 70277760.

The previous prime is 128857667. The next prime is 128857721. The reversal of 128857701 is 107758821.

It is not a de Polignac number, because 128857701 - 2²¹ = 126760549 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 128857701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128857721) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 711831 + ... + 712011.

It is an arithmetic number, because the mean of its divisors is an integer number (4357080).

Almost surely, 2^128857701 is an apocalyptic number.

It is an amenable number.

128857701 is a deficient number, since it is larger than the sum of its proper divisors (80282139).

128857701 is a wasteful number, since it uses less digits than its factorization.

128857701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394 (or 387 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 39.

The square root of 128857701 is about 11351.5505989270. The cubic root of 128857701 is about 505.0915770270.

The spelling of 128857701 in words is "one hundred twenty-eight million, eight hundred fifty-seven thousand, seven hundred one".