128637481 has 8 divisors (see below), whose sum is σ = 147917504. Its totient is φ = 109583280.

The previous prime is 128637469. The next prime is 128637491. The reversal of 128637481 is 184736821.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 128637481 - 2¹⁵ = 128604713 is a prime.

It is a super-2 number, since 2×128637481² = 33095203036050722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (128637401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 55230 + ... + 57511.

It is an arithmetic number, because the mean of its divisors is an integer number (18489688).

Almost surely, 2^128637481 is an apocalyptic number.

It is an amenable number.

128637481 is a deficient number, since it is larger than the sum of its proper divisors (19280023).

128637481 is a wasteful number, since it uses less digits than its factorization.

128637481 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112911.

The product of its digits is 64512, while the sum is 40.

The square root of 128637481 is about 11341.8464546122. The cubic root of 128637481 is about 504.8036762604.

The spelling of 128637481 in words is "one hundred twenty-eight million, six hundred thirty-seven thousand, four hundred eighty-one".