128667537 has 48 divisors (see below), whose sum is σ = 198864640. Its totient is φ = 80061696.

The previous prime is 128667533. The next prime is 128667547. The reversal of 128667537 is 735766821.

It is not a de Polignac number, because 128667537 - 2² = 128667533 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 128667492 and 128667501.

It is not an unprimeable number, because it can be changed into a prime (128667533) 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, 1628664 + ... + 1628742.

Almost surely, 2^128667537 is an apocalyptic number.

It is an amenable number.

128667537 is a deficient number, since it is larger than the sum of its proper divisors (70197103).

128667537 is a wasteful number, since it uses less digits than its factorization.

128667537 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 262 (or 259 counting only the distinct ones).

The product of its digits is 423360, while the sum is 45.

The square root of 128667537 is about 11343.1713819372. The cubic root of 128667537 is about 504.8429887989.

The spelling of 128667537 in words is "one hundred twenty-eight million, six hundred sixty-seven thousand, five hundred thirty-seven".