128649974 has 16 divisors (see below), whose sum is σ = 203400720. Its totient is φ = 60933600.

The previous prime is 128649973. The next prime is 128649977. The reversal of 128649974 is 479946821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128649973) 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, 17852 + ... + 23999.

It is an arithmetic number, because the mean of its divisors is an integer number (12712545).

Almost surely, 2^128649974 is an apocalyptic number.

128649974 is a deficient number, since it is larger than the sum of its proper divisors (74750746).

128649974 is a wasteful number, since it uses less digits than its factorization.

128649974 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41935.

The product of its digits is 870912, while the sum is 50.

The square root of 128649974 is about 11342.3971893070. The cubic root of 128649974 is about 504.8200175531.

The spelling of 128649974 in words is "one hundred twenty-eight million, six hundred forty-nine thousand, nine hundred seventy-four".