128697957 has 32 divisors (see below), whose sum is σ = 198144000. Its totient is φ = 82470960.

The previous prime is 128697931. The next prime is 128697971. The reversal of 128697957 is 759796821.

It is not a de Polignac number, because 128697957 - 2¹⁰ = 128696933 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128697917) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 149394 + ... + 150252.

It is an arithmetic number, because the mean of its divisors is an integer number (6192000).

Almost surely, 2^128697957 is an apocalyptic number.

It is an amenable number.

128697957 is a deficient number, since it is larger than the sum of its proper divisors (69446043).

128697957 is a wasteful number, since it uses less digits than its factorization.

128697957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078 (or 1072 counting only the distinct ones).

The product of its digits is 1905120, while the sum is 54.

The square root of 128697957 is about 11344.5121975341. The cubic root of 128697957 is about 504.8827712075.

The spelling of 128697957 in words is "one hundred twenty-eight million, six hundred ninety-seven thousand, nine hundred fifty-seven".